Answer:
-2x+8y=-8...........(1)
5x+8y=20
5x=20-8y
x=(20-8y)/5.........(2)
Step-by-step explanation:
putting the value of x in equation (1)
-2(20-8y)/5+8 y=-8
(-40+16 y )/5=-8-8y
-40+16 y=(-8-8y)×5
-40+16 y=-40-40y
40y+16y=40+40
56y=80
y=80/56=20/14=10/7
again
putting the value of y in equation (2)
x=(20-8×10/7)/5=(20-80/7)/5=(140-80)/7×1/5=60/35=12/7
