Question

resolva o sistema de equação

A) X+Y=15
X-Y=9

B) X+Y=10
X-Y= -6

C)X+Y=15
X-Y= -5

D) X+Y=4
X-Y=10

Answer 1

A) x+y=15
x-y=9
2x=24
x=24/2
x=12

x+y=15
12+y=15
y=15-12
y=3

x=12 e y=3

B) X+Y=10
X-Y= -6
2x=4
x=4/2
x=2

x-y=-6
2-y=-6
-y=-6-2
-y=-8
y=8

x=2 e y=8

C) X+Y=15
X-Y= -5
2x=10
x=10/2
x=5

x+y=15
5+y=15
y=15-5
y=10

x=5 e y=10

D) X+Y=4
X-Y=10
2x=14
x=14/2
x=7

x+y=4
7+y=4
y=4-7
y=-3

x=7 e y=-3
Espero ter ajudado......