Question

2x+y=15
x+y=10 ???? alguém me ajuda

Answer 1

y= 10-x

2x+y= 15
2x+(10-x) = 15
2x+10-x= 15
2x-x = 15-10
x = 5

y = 10-x
y = 10-5
y= 5

S = (5,5)