Question

Me ajudemmm é trabalho pra hoje!!

Answer 1

A)
X+y=11
x-y=3

2x=14
x=14÷2
x=7

x+y=11
y=11-7
y=4

B)x+y=6
2x+y=4

x+y=6
x=6-y

2x+y=4
2.(6-y)+y=4
12-2y+y=4
-2y+y=4-12
-y= -8 .(-1)
y=8

x=6-8
x =-2


C)3x+y=5
2x+y=4

3x+y=5
y=5-3x

2x+y=4
2x+5-3x=4
-x=4-5
-x=-1 .(-1)
x=1

y=5-3.1
y=2