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How would you find the b in a problem like y= -15/-3 + b? The points are (-6,13) and (3,-2)

User Yskkin
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1 Answer

5 votes

Answer:

y = -5/3x +3

Explanation:

You want the slope-intercept equation of the line through points (-6, 13) and (3, -2).

Slope

The slope is given by the formula ...

m = (y2 -y1)/(x2 -x1)

m = (-2 -13)/(3 -(-6)) = -15/9 = -5/3

Intercept

The y-intercept (b) can be found using one of the points and the equation for the line:

y = mx +b

b = y -mx . . . . . subtract mx to solve for b

b = 13 -(-5/3)(-6) = 13 -10 = 3 . . . . . using (x, y) = (-6, 13)

Equation

The equation for the line is y = -5/3x +3.

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User Xavier Lucas
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