Respuesta :
Answer:
Step-by-step explanation:
x + y = 10
sub x with -21
-21 + y = 10
plus 21 on both sides to get y by it's self
y = 31
Answer:
Step-by-step explanation:
x + y = 10
sub x with -21
-21 + y = 10
plus 21 on both sides to get y by it's self
y = 31