Question

PLEEAAAASE help
if a+1 is divisible by 3 prove that 4+7a is divisible by 3 too

Answer 1

Given a is 5

Explanation:

I. Given a is 5

= a + 1

= 5 + 1

= 6

6 is divisible by 3 => true

II. Find 4 + 7a value

= 4 + 7(5)

= 4 + 35

= 39

39 is divisible by 3 => true

III. Prove by

6 ÷ 3 = 3

39 ÷ 3 = 13

Hope that help :)