Question

Plz solve question 12

Answer 1

Answer: C

Step-by-step explanation:

To solve for 12, we can use eliminate or substituion to solve our system of equations. Let's use elimination method.

$\left \{ {{3f-2k=10} \atop {-3f-2k=14}} \right.$

Let's add the equations together. This way, 3f+(-3f)=0

$-4k=24$                   [divide both sides by -4]

$k=-6$

Now that we know k, we can plug it into either equation to find f.

$3f-2(-6)=10$        [multiply]

$3f+12=10$             [subtract both sides by 12]

$3f=-2$                    [divide both sides by 3]

$f=-\frac{2}{3}$

Now that we have f and k, we know that C is the correct answer.