Question

Which value of x satisfies both -9x + 4y= 8 and -3x - y= 4 given the same value of y?A.(ol|--B.7OC.87D.-9OE.3

Answer 1

Choice C. -8/ 7

Step-by-step explanation:

We have to solve the system

`\begin{gathered} -9x+4y=8 \\ -3x-y=4 \end{gathered}`

Multiplying the equation at the bottom by -3 gives

`-9x-3y=12`

Now adding the two equations gives