If x +y = 14 and x - y = 6, then the product of 2
and y is equal to which of the following?

Answer:
40
Step-by-step explanation:
x+y=14
x-y=6
---------------------
x=-y+14
x-y=6
---------------------
Substitute:
-y+14-y=6
-2y+14=6
-2y=-8
y=4
x=-y+14
x=-4+14
x=10
---------------------
4•10=40