Question

Resolva os sistemas de equação:
a)x-2y=3
x+2y=7


b)x+2y=5
3x-2y=-25


c)x-10=-y
x-y=2


d)y-30=-x
x-y=10


e)2x+y=-3
-x-y=1

Answer 1

a)2x = 10
x = 5

b)4x = -20
x = -5

c)x+y=10
x-y=2
2x = 12
x = 6

d)x+y=30
x-y=10
2x=40
x=20
e) x = -2