Question

10x - 10y = 1g
4x +5y=22

Answer 1

10x-10y=19
4x+5y=22

20x-20y=38
-20x-25y=-110

-45y=-72
y=8/5

4x+5(8/5)=22
4x+8=22
4x=14
x=7/2
____________________
10(7/2)-10(8/5)=19
4(7/2)+5(8/5)=22

35-16=19
14+8=22

19=19
22=22