This is similar to Problem 3 from your Section 1.2 worksheet.

Simplify each of the following expressions.

a) $9(x-y)-8(y-x)$ =



b) $\dfrac{1}{9}\cdot 9 (3 - y) + (y + 4)7$ =



c) $9 xy^2 - 8(x+y) + 5 (5 y - 7)$ =

Hint:

Hint: