Question

Which equation is true for the value a = 7?
A. a + 2(a – 3) = 15
B. 4a – 4(14 – a) = 24
C. 2a + 47 = 105
D. 3a + 2(a – 3) = 34
E. 4a - 2a = 18

Answer 1

If a = 7 then you would want to plug in 7 for a in each equation to see which one comes out to the right answer.

First we can try A:

a + 2(a – 3) = 15
(7) + 2 ( (7) - 3) =15
7 + 2 (4) = 15
7 + 8 = 15
15 = 15

Since 15 does equal 15 that tells us the answer is correct

Answer 2

it dose not match A with 7

Answer 3

what do you mean?

Answer 4

did you see the equation i did above??

Answer 5

If you plug 7 into any of the other equations, the answer would equal itself, so it would prove that those other options are incorrect

Answer 6

so its A

Answer 7

yup

Answer 8

do you understand it though?

Answer 9

ok thx

Answer 10

alr lol np :)