Question

A)X+y=8
2x-3y=-9
B)x+y=10
X-y=2
C)2x+y=5
X+y=2
D)x-y=10
X-3y=0
E importante me ajudem !!

Answer 1

a)
x+y=8
2x-3y=-9
x=8-y
2(8-y)-3y=-9
16-2y-3y=-9
-5y=-25(-1)
5y=25
y=5
x=8-5
x=3

b)
x+y=10
x-y=2
2x=12
x=6
6+y=10
y=10-6
y=4

c)
2x+y=5
x+y=2(-1)
2x+y=5
-x-y=-2
x=3
3+y=2
y=2-3
y=-1

d)
x-y=10
x-3y=0
x=10+y
10+y-3y=0
-2y=-10(-1)
2y=10
y=5
x-5=10
x=10+5
x=15