Question

Resolva:
a) {2x+y=15
{x-y=30


B) {2x+2x=40
{x-y=10

Answer 1

2x+y=15
X-y=30

3x= 45
x= 45/3
x= 15

2.15+ y=15
y= 15-30
Y= -15

B) 2x+ 2y= 40
X-y=10 .(2)

2x+2y=40
2x-2y=20

4x=60
x= 15

15-y= 10
y= 5