Question

x+y:1
4x+7y:10



x+5y:-25
2x-2y:10


3x+y:3
x-2y:2

Answer 1

a)
x=1-y x=2-1
4.1-y + 7y=10 x=1
4-4y+7y=10
3y=6
y=6/3
y=2

a)
y=2
x=2-1
x=1

b)
x=-25-5y x=-25-5.4
2.25-5y=10 x=-25-40
50-10y=10 x=-65
-10y=10-50
(-1) -10y=-40
10y=40
y=40/10
y=4

b)
x=-25-5.4
x=-25-40
x=-65