19) Solve the system,

x + 3y - 5
-2x + 2y = 14

y = 3

x = -4

Step-by-step explanation:

Hopefully the first equation is x + 3y = 5

x = 5 - 3y

Plug in:

-2(5 - 3y) + 2y = 14

-10 + 6y + 2y = 14

8y = 24

y = 3

x = -4

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value