Question

Resolva os sistemas pelo método da adição:
a)x+y= -1
3x-y=3

b)5x-y=4
2x-y= -5

c)x+2y=7
4x-y=10

d)3x-2x=7
x+3y= -16

Answer 1

a)x+3x=4x
y-y=0
-1+3=2

4x=2
x=2/4=1/2

b)5x+2x=7x
-y-y=-2y
4-5=-1

7x-2y=-1

c)x+4x=5x
2y-y=y
7+10=17

5x+y=17

d)3x+x=4x
-2y+3y=y
7-16=-9

4x+y=-9