Make x the subject of the following

Question

And show the working

a) y=x+2

Answer 1

Subtract 2 from both sides:

y - 2 = x

Therefore, x = y - 2.

b) 3x - 4 = 7

Add 4 to both sides:

3x = 11

Divide both sides by 3:

x = 11/3

Therefore, x = 3.67 (to 2 decimal places).

c) 4x + 3y = 8

Subtract 3y from both sides:

4x = 8 - 3y

Divide both sides by 4:

x = (8 - 3y)/4

Therefore, x = 2 - 0.75y.