Question

X+y=7
x-y=3
2x-3y=15
3x-2y=10

Answer 1

Explanation:

x+y=7 _ eqn1

x-y=3_ eqn2

add eqn1 and eqn2

x+y=7

+ x-y=3

= 2x= 10

x=5

x+y=7

5+y=7

y=7-5

y=2 proved