1)

Expanding the expression:

-2(8a + 7b) + 4(a - 2b)
= -16a - 14b + 4a - 8b
= -12a - 22b

2)

Expanding the expression:

9(2x - 3y) - 8(y - x)
= 18x - 27y - 8y + 8x
= 26x - 35y