Question

Which equation represents the line that passes through the points (7, 8) and (3, -4_?

y = x + 1
y = 3x - 13
y = -x + 15
y = -3 + 29

Answer 1

Explanation:

(7, 8) and (3, -4)

y2 = -4, y1 = 8, x2 = 3 and x1 = 7

Slope m = {y2-y1}/{x2-x1}

m = {-4 - 8}/{3 - 7}

m = -12/-4

m = 3

And

y - y1 = m(x - x1)

y - 8 = 3(x - 7)

y - 8 = 3x - 21

y = 3x - 21 + 8

y = 3x - 13