Question

find the value of 3a - 2b if { 5 7 / 2 8 } b = { 2 3 / 5 7 }​

Answer 1

Answer:

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.

solution