Question

Could someone help me do this using substitution I need to know how to do this for math

Answer 1

X=y-7
x=2-8y
both equal x so
subsitute y-7 for x in other equaton
y-7=2-8y
add 8y
9y-7=2
add 7
9y=9
divide 9
y=1
sub back
x=y-7
x=1-7
x=-6

(x,y)
(-6,1)

Answer 2

Y-7=2-8y
+8y    +8y
___
9y-7=2
    +7  +7
          ____
    9y=8
_______
       9
y=0.88