Question

Consider the algebraic equation x + 3 = 9.

What value can we substitute for x to make it a true
number sentence?

Answer 1

x = 6

Explanation:

To make x on its own:

x + 3 - 3 = 9 - 3

x = 6

Answer 2

x+3=9

x+3-3=9-3

x=6

Explanation:

now check:

(6)+3=9

9=9