Answer:
13. x = 4
14. x = -16
15. x = 11
Step-by-step explanation:
x=5, y=-3
we can find the answer by plugging in x=3y+14 to the second equation
5(3y+14)-2y=31
simplify
15y+70-2y=31
13y=-39
y=-3
now, plug in this to the initial equation x=3y+14
x=3(-3)+14
x=-9+14
x=5
both the equations are identities
