Question

a) {x - y = 10
{2 x + 3y = 10

b) {x + y = 48
{x + 8 = 3y + 24

Answer 1

a) {x-y=10
{2x+3y=10
x=10+y
2(10+y)+3y=10
20+2y+3y=10
2y+3y=10-20
5y=-10
y=-10/5
y=-2
x=10+2y
x=10+2.(-2)
x=10-4
x=6
b) {x+y=48
{x+8=3y+24
x=48-y
48-y+8=3y+24
-y-3y=24-8-48
-4y=24-56
-4y=-32.(-1)
4y=32
y=32/4
y=8
x=48-y
x=48-8
x=40

Answer 2

a)
x=+8
y=-2

8-(-2)=10
2.(8)+3.(-2)=10