it's usually easier if yu clear fractions. So,multiply #1 by4, #2 by 8:
4y = x + 16
8x = 172 + 7y
now you can rearrange things as you wish:
-x + 4y = 16
8x - 7y = 172
solution: (32,12)
y=x/4+4
x=21.5+7y/8
1 answer