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What is the equation of a line that passes through (7,8) and has a slope of -3
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What is the equation of a line that passes through (7,8) and has a slope of -3

What is the equation of a line that passes through (7,8) and has a slope of -3-example-1
User Mohammed Mukhtar
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2 Answers

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You use y=mx+b, then substitute -3 for the slope (m) and 7 for x and 8 for y, after you substitute all those things - use that equation to solve for the b-term - that will give you the y-intercept. Then you will rewrite the equation of the line as y=-3x+(whatever you just found for b). 
User Charo
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3 votes
It is helpful to first plug this in to point-slope form (note that there are other ways to do this).

Using the form
y-y_1 = m(x-x_1), you get
y-8=-3(x-7). You can simplify this to get
y = -3x+29.

Answer choice A
User Amir Astaneh
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7.8k points
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