I've already got the coordinates of the two points, and I can figure out the slope. What next? How do I find the y-intercept?
2006-09-28 14:07:03 · 6 answers · asked by 2 days after my B day :) 2 in Science & Mathematics ➔ Mathematics
When x=0 the line of the equation will be somewhere on the y axis, think about it in a rational way
For a simple equation such as y=x (you should know that this is a diagonal line straight through the origin (x=0, y=0)) the line intercepts(crosses) the y axis at y=0
similarly y=x+2 this is a diagonal line but raised by 2 units, and so when x=0, y=2
therefore the y-intercept is 2
2006-09-28 14:17:21 · answer #1 · answered by United_Until_I_Die 3 · 0⤊ 0⤋
use y=mx+b where y is your y value, x is your x, m is your slope and find the equation of your line. You need the b value. Ex. Y=4x+b. Substitute a zero for x since x is always zero when you have a y intercept. you should get your answer.
2006-09-28 21:09:56 · answer #2 · answered by caitlin_batts 2 · 0⤊ 0⤋
Y=MX+b
Where M = the slope
X = the horizontal coordinate
Or you can set X and Y equal to zero
2006-09-28 21:10:19 · answer #3 · answered by Anonymous · 0⤊ 0⤋
remember,graphs of a straight line=y=mx+c
m=gradient
c=intercept
Well then,find the gradient of the two co-ordinates:
y2-y1/x2-x1
Once you've got your gradient you got the mx
to find the y,form an equation using y=mx+c
For the y,find what you already know about the two y co-ordinates given earlier.subtract the two and then you can form your equation.
2006-09-29 05:48:59 · answer #4 · answered by radioconcrete 2 · 0⤊ 0⤋
thats where the line or slope crosses the y-axis
2006-09-28 21:14:20 · answer #5 · answered by Anonymous · 0⤊ 0⤋
for the y-intercept x is always 0
figure it out!
2006-09-28 21:09:35 · answer #6 · answered by kujo_mojo 1 · 0⤊ 1⤋