Question

Can someone PLEASE help me understand this?

Answer 1

a. x = 15, y = 12
b. x = 14, y = 11
c. x = 14, y = 12
d. x = 15, y = 11

Answer 2

Hint: Properties of similar triangles
http://www.ask-math.com/properties-of-similar-triangles.html

Answer 3

3x-7=2x+7
find x,then 2x+7 to find y

Answer 4

the two lines with arrows are parallel hence,
by property corresponding angles

\(2x+7=3x-7\)

and by property of consecutive interior angles

\(3x-7+12y+1=180^{\circ}\)