X/2 + 2 = x – y / 10  x = 2 ( y + 2 )

1

a) 3a + b + c

b) a²b + 2d

c) 7x²y + 6xy - 2yx - 2x + x²y²

d) 21xy - 7x²y - 6x²

e) 5 + a² - 7a² + 5b²

2

a) y = 10 + 3 + 9 – 6

y = 16

b) y = 40 + 16

y = 56

c) y = 1 + 4 +3 + 8

y = 15

d) y = - 8 + 4 + 1

y = - 3

3

a) f(-3) = 2 - 5x(-3)

f(-3) = 17

b) f(1) = 2 - 5x1

f(1) = -3

4

a) - 7

b) f(1) = 3x1 - 7

f(1) = - 4

c) f(-2) = 3x(-2) - 7

f(-2) = - 13

5

a) 4x - 8 = 0

4x = 8

x = 8/4

x = 2

b) - 2x - 20 = 0

- 2x = 20

x = - 20/2

x = - 10

c) 8x +10 = 0

8x = - 10

x = - 10/8