Question

3. If 3a - 7 = - 4a, then a equals​

Answer 1

3a+2b=13

4a−2b=8

____________

7a+0=21

a=

7

21

=3

So 3(3)+2b=13

2b=13−9

b=

2

4

=2

So, a+b=3+2=5.

Answer 2

3a - 7 = - 4a

3a + 4a = 7

7a = 7

a = 7 ÷ 7

a = 1

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