Question

A) X+ Y=12 e X- 3Y = 4 B) 2X + 3Y = 5 E X -2Y= -1

Answer 1

X+Y=12 × (3)

X-3Y=4

3x+3y= 36

x-3y= 4

4x= 40

x= 40÷ 4

x=10

3.10+3y=36

3y=36-30

y=6÷3

y=2

B)

2x+3y=5 ×(2)

x-2y=-1 × (3)

4x + 6y=10

3x- 6y =-3

7x=7

x=1

4.1+6y=10

6y=10-4

y=1