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

In the first equation you'll get \(x = y + 3\) by adding y to both sides.
Substitute in the second equation.

\( \color{Black}{\Rightarrow 3(y + 3) - 8y = 9 }\)

You solve for y, and then add 3 to get x.

Answer 2

But you don't need to get x according to the question.

Answer 3

multiply equation1 by 3 and subtract each of them and find y and x

Answer 4

x=3,y=0