7y-23 plus 23x-16 plus 8x -21 find x and y show steps

Using the figure below, select the two pairs of alternate interior angles. a: point 1 and point 4 b : point 2 and point 3 c: point 6 and point 6d: point 5 and point 7

Ineed to find the answer to number 2

Use the distributive property -7(-2x+u-2)