Question

Solve the system x - y = 3 and 3x - 8y = 9. What is the value of y?
A. 3
B. 0
C. 6
D. -2

Answer 1

It may be 0 which is option B but I need to check the equation work.

Answer 2

y = 0

Answer 3

x - y = 3-----> -3x + 3y = -9

3x - 8y = 9 --->3x -8y = 9
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-5y = 0
y = 0

Answer 4

1st eqn: y = -3 + x

Plug this in to the second eqn:

3x - 8*(-3+x) = 9

3x +24 - 8x = 9

-5x +24 = 9

-5x = -15

x = 3

Plug x=3 into the first eqn:

(3) - y = 3

-y = 0

y = 0