Question

A - 2x+y=10
x-y= - 4


B- 4x-3y=-25
-8x+2y=+5

Answer 1

A ) 2x+y=10. x-y=-4
x-y=-4. 3 -y=-4
______. -y=-4-3
3x = 6. -y=-7
x= 6/2. y=7
x= 3

B)4x-3y=-25
-8x+2y=5

(× 2). 8x -6y= -50
(× 3) -24x+6y=15
______________
-16 x = 35
x= 35/16

4. 35/16-3y= -25
35/4-3y= -25
-3y= -25-35/4
-3y= -135/4
y=+135/4.1/3
y= 135/12
y= 45/4