Question

resolva os sistemas

A) x+y=2
x-y=5

B)x+y=3
2x+y=4

Answer 1

A) x+y=2
X-y= 5
2x=7
x=7/2
X=7/2

X+y=2
7/2+y=2
Y= 2-7/2
Y= 4-7
Y= -3