Question

Solve the following equations:

(1) x + 1 = 6
(2) x + 4 = 3
(3) x − 3 = 5
(4) 2x = 8
(5) $\frac{a}{3}=7$
(6) 5a = − 20

Answer 1

(1) x + 1 = 6
⇒ x = 6 − 1
∴ x = 5

(2) x + 4 = 3
⇒ x = 3 − 4
∴ x = − 1

(3) x − 3 = 5
⇒ x = 5 + 3
∴ x = 8

(4) 2x = 8
⇒ x = $\frac{8}{2}$
∴ x = 4

(5) $\frac{a}{3}$ = 7
⇒a = 7 × 3
∴ a = 21

(6) 5a = −20
⇒ a = $\frac{-20}{5}$
∴ a = −4