Answer:
x=11, y =1
Step-by-step explanation:
x+y=12
-x=-y-10
multiply by -1
-1*(-x)=-1(-y-10)
x = y+10
substitute this into the first equation. everytime you see x put in y+10
x+y=12
(y+10) + y =12
combine like terms
2y+10 =12
subtract 10 from each side
2y+10-10=12-10
2y = 2
divide by 2
2y/2 =2/2
y =1
now we need to find x
x = y+10
x = 1+10
x =11
