Log in retrest 6 years agoPosted 6 years ago. Direct link to retrest's post “How do you find the y int...” How do you find the y intercept? • (19 votes) michael Li 6 years agoPosted 6 years ago. Direct link to michael Li's post “You can take the function...” You can take the function f(x) = something (your funtion) so like f(x)=2x. you can input x=0 and find the output which would be the y intercept. So, lets actually have f(x) = 5x + 2. You input 0 for x and you get f(x) = 2. That is your y intercept (24 votes) Ani-Jay 7 years agoPosted 7 years ago. Direct link to Ani-Jay's post “How do you know where to ...” How do you know where to put your intercepts when answering the problems.? I haven't been able to get 100% on the practice problems, because my answers need to be reversed, but I can't figure out where to place them. • (11 votes) bgale28 7 months agoPosted 7 months ago. Direct link to bgale28's post “in slope-intercept form, ...” in slope-intercept form, ( y=mx+b ) b represents your y-intercept. (5 votes) AshwathMalaisamy 10 years agoPosted 10 years ago. Direct link to AshwathMalaisamy's post “for example how would you...” for example how would you find the x intercept for a problem like this ?Y = x2 + 5x + 4 • (5 votes) Rachel 10 years agoPosted 10 years ago. Direct link to Rachel's post “It's a quadratic equation...” It's a quadratic equation, which means it's a non-linear (is parabolic in shape). You can find the x-intercepts (usually there are 2, but there can be 1 or none) by completing the square, factoring or by using the quadratic formula. Which method I use depends on which one I think will make solving the problem easier. The easiest way to solve is to factor the quadratic equation. We set it equal to zero because we are looking for the x intercepts. To solve by factoring we ask ourselves: What two numbers add up to the middle term and are the product of the last term? (11 votes) Sara Beth 8 years agoPosted 8 years ago. Direct link to Sara Beth's post “Can't you find the interc...” Can't you find the intercept by doing -b/2a, or is that finding the vertex? • (5 votes) KathyC 8 years agoPosted 8 years ago. Direct link to KathyC's post “A vertex is a corner, whe...” A vertex is a corner, where two lines meet. A straight line by itself doesn't have a vertex. The easiest way to find the x intercept is to figure out what value x will have when y = 0. (8 votes) poodoo a year agoPosted a year ago. Direct link to poodoo's post “at 0:48 where did 0 come ...” at • (6 votes) Venkata a year agoPosted a year ago. Direct link to Venkata's post “We need to find the x int...” We need to find the x intercept. So, as it is a point on the x axis, the y coordinate has to be 0. So, we substitute y = 0 into the equation. (4 votes) daP0l15hc0unt 6 years agoPosted 6 years ago. Direct link to daP0l15hc0unt's post “Slope intercept form is y...” Slope intercept form is y=mx+b. My attempt: • (5 votes) KoJesko 6 years agoPosted 6 years ago. Direct link to KoJesko's post “If m = 3 and b = 2 (Subst...” If m = 3 and b = 2 (Substitute) 0 = 3x + 2 (0 = mx + b) (Subtract b from both sides) (5 votes) Ammon Trump 6 years agoPosted 6 years ago. Direct link to Ammon Trump's post “How would I find the x an...” How would I find the x and y intercepts and graph them if I have a function 3x - 5y=15 • (6 votes) bgale28 7 months agoPosted 7 months ago. Direct link to bgale28's post “You can substitute the x ...” You can substitute the x or y to find the other intercept or vice versa. For example, if x was zero in 3x - 5y = 15 then your y-intercept is -3. Or for example, if y was zero in 3x - 5y = 15 then your y-intercept is 5. (1 vote) rreid 5 months agoPosted 5 months ago. Direct link to rreid's post “i understood nothing in t...” i understood nothing in the video • (5 votes) Angelina 11 days agoPosted 11 days ago. Direct link to Angelina's post “I can explain!The x-int...” I can explain! The x-intercept of a line is the point at which the line crosses the x-axis. In other words, it’s the value of x when y equals zero in the equation of the line. For a line represented by the equation y=mx+b, So, if we set y to zero, we get: 0=mx+b Solving for x gives us: x=−b/m This value of x is the x-intercept of the line. It represents the point on the x-axis where the line intersects. If the line never crosses the x-axis, then it has no x-intercept. For example, the line y=2x+3 has an x-intercept at x=−3/2 This means the line crosses the x-axis at the point (-1.5, 0). I hope this explanation helps! Let me know if you have any other questions. (1 vote) Dooder 9 months agoPosted 9 months ago. Direct link to Dooder's post “Theoretically could there...” Theoretically could there be a "z" axis? • (3 votes) cameronsmith 8 months agoPosted 8 months ago. Direct link to cameronsmith's post “Yes, we could have a z-ax...” Yes, we could have a z-axis. You could graph planes, spheres, and all sorts of other figures. You probably won’t run into 3D graphs unless you do higher-level math. Here is an article on 3D space from the multivariable calculus course: https://www.khanacademy.org/math/multivariable-calculus/thinking-about-multivariable-function/ways-to-represent-multivariable-functions/a/multidimensional-graphs You probably won’t understand all of it yet, but you might find it interesting! (3 votes) Nakulisthebest 2 years agoPosted 2 years ago. Direct link to Nakulisthebest's post “I have a question what is...” I have a question what is the equation of x intercept? • (3 votes) Kim Seidel 2 years agoPosted 2 years ago. Direct link to Kim Seidel's post “There is no equation. Yo...” There is no equation. You take the linear equation that you have and you replace Y with 0. Then, solve for X. You will have a point on the line at (x-value, 0) where the x-value is the value you found. This point is where the line cross the x-axis (so, it is the x-intercept). (2 votes)Want to join the conversation?
y = x squared plus five x plus four
x^2+5x+4=0
When y is 0 where will the parabola cross the x-axis
4*1=4 (last term)
4+1=5 (middle term)
(x+4) (x+1)
set them both equal to zero to find the x intercept
x+4=0
subtract 4 from both sides
x=-4
x+1=0
subtract 1 from both sides
x=-1
x intercepts are -4 and -1. Or the points where the parabola crosses the x-axis are (-4,0) and (-1,0).
So if you have an equation of a line: 2y + 4x = 28
you substitue "0" in for your y and solve:
2 (0) + 4x = 28
4x = 28
x = 7
The x intercept is (7,0)
0:48
Is there a way to use the x-intercept instead of the y-intercept. Use p for the y-intercept in your equation.
y = mx + b
0 = mx + b
0 = x + b/m
x = -b/m
let p be the x-intercept
therefore: p = -b/m
Therefore:y = mx - mp
Am I right?
0-2 = 3x (y-b = mx) -2 = 3x (y-b = mx) (divide both sides by the amount x is multiplied by) -2/3 = x
where m is the slope and b is the y-intercept, the x-intercept can be found by setting y to zero and solving for x.
or x=−1.5.
Like on a 3 dimensional graph?
Do those exist?
See Also
9.3: Factoring of the Quadratic