Question

Write in slope-intercept form an equation of the line that passes through the given points.

(−1, −1), (1, 5)

Answer 1

y=3x+2

Explanation:

y=mx+b

Find the slope (m) with the formula y2-y1/x2-x1

5-(-1)/1-(-1) = 6/2 = 3

Find b. Pick a point and plug the x and y values into the equation. Then simplify.

• 5=3(1)+b
• 5=3+b
• 2=b

Then plug the m and b values into y=mx+b, and there's your equation: y=3x+2