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An **expression **is a mathematical function which is not equating something.

For example:

3x + 4y + 2

An **equation **is a mathematical function which is saying this is equal to this.

For example:

3x + 4y + 2 = 3

Master.

Question 1.

Simplify the following:

a) 2x + 3y + 4x

b) 2xy + 3xy + 2x

c) 2y – 2y + 2x

d) 0.002x + 0.201x

e) 2x(x+3y)

f) 34x(x – 2y) + 2xy

g) -2xy(3y-2x)

Question 2.

Solve the following equations

a) 3x + 4 = 7

b) 2x^{2} = 8

c) 3x = 4

d) 2-23a = 0.002

e) (1 -3x) – 2(x+3) = 3

f) 34x(x – 2) + 2x = -2x

g) 8h – 13(2-h) + 3 = 0