Question

Solve the system of equations using elimination: x+y = -4 and x -8y = 68

Answer 1

Answer: x=4, y=-8

Explanation:

x+y= -4

x= -4-y

put x=-4-y into the equation x-8y=68,

-4-y-8y=68

-4-9y=68

-9y= 68-(-4)

-9y=68+4

-9y=72

y=-8

put y=-8 into the equation into x+y=-4

x+(-8)=-4

x-8=-4

x=-4-(-8)

x=-4+8

x=4