Find the slope of the line through each pair of points

(0, -7), (-17, 11)

To find the slope (m), use the slope formula:

     and plug in the two points

(-17, 11) = (x₁, y₁)

(0, -7) = (x₂, y₂)

[lines usually go from left to right, so the point furthest to the left is the 1st point]

 [two negative signs cancel each other out and become positive]

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true