X is 5 in this case!!!!hope it helps
X + y = 6
x - 6y = -9
Subtract the equations, you get:
y - (-6y) = 6 - (-9)
7y = 15
y = 15/7
x + 15/7 = 6
x + 15/7 = 42/7
x = (42-15)/7
x = 27/15
None of your answer choices are correct, since the solution to the systems of equation is (27/15, 15/7)
Number of friends - x
50-3x=2
-3x=-48
3x=48
x=16
Jack has 16 friends.
10 because 7 x 3 = 21 and 7 + 3 = 10 so your answer is 10