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Question 1013117: i am having a hard time solving a line when slope is -2 and the x intercept is 4. I know so far that in the line y=mx+b that m=-2 and when y=0 x=4 but I dont know what to do next.
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! When the slope is -2, the line has the form y=-2x
the y-intercept gives you the last term.
You have two ways to get it.
One is to use y=-2x+b
When y=0, x=4. Substitute them in
0=-2(4)+b
0=-8+b
b=8
y=-2x+8
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The other way is to use the point slope formula.
y-y1=m(x-x1), where (x1,y1) are coordinates of a point.
y-0=-2(x-4)
y=-2x+8
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Either one works.
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