Question

b){2x-5y=27
x-2y=0

c){3x-y=-2
2x-y=-4

d){2x-5y=15
x

Answer 1

{2x-5y=27
x-2y=0
2x-5y=27
2x=27+5y
x=27/2+5y/2
x-2y=0
27/2+5y/2-2y=0
27/2+5y/2-4y/2=0
27+5y-4y=0
27+y=0
y=27
x-2y=0
x-2.-27=0
x-54=0
x=54
C){3x-y=-2
2x-y=-4
{3x-y=-2
2x-y=-4(-1)
{3x-y=-2
-2x+y=4
x=2
3x-y=-2
3.2-y=-2
6-y=-2
-y=-2-6
-y=-8(-1)
y=8
D){2x-5y=15
x+3y=35
2x-5y=15
2x=15+5y
x=15/2+5y/2
x+3y=35
15/2+5y/2+3y=35
15/2+5y/2+6y/2=70/2
15+5y+6y=70
15+11y=70
11y=70-15
11y=55
y=55/11
y=5
x=15/2+5y/2
x=15/2+5.5/2
x=15/2+25/2
x=40/2
x=20