Question

resolva o sistema
2x-y=20
y=48-2x

Answer 1

2x-y=20
x=20/2+y
x=10+y

y=48-2x
y=48-2(10+y)
y=48-20-2y
y=28-2y
y/2y=28
y=28*2

y=56 ✓


x=10+y
x=10+56

x=66 ✓