Question

2x-y=0
x+y=15


conta montada por favor :-)

Answer 1

x = 15 - y

2x - y = 0

2 (15 - y) = 0

30 - 2y = 0

- 2y = - 30 (-1)

2y = 30

y = 30/2

y = 15

x = 15 - y

x = 15 - 15

x = 0