Question

sistema 2x2:

x/5=10+y/2
x-y=29

Answer 1

x/5 = 10 + y/2 => x = 50 + 5y/2

substituindo

50 + 5y/2 - y = 29
100 + 5y -2y = 58
3y = 58 -100
y = -42/3
y = -14

substuindo y em x-y=29

x - (-14) = 29
x = 15