What is the answer? i don’t understand

The first thing you want to do is find out what the sqrt(7) is. Use your calculator to do this. Most calculators do it this way

7

^ or y^x or x^y or some calculators do it with a √ key see below.

0.5

=

You should get 2.64 something. If your calculator has a √ key you do it as

√

=

Regardless of that, the answer you should get is 2.64. The friend certainly did not do that. A and C are both wrong for the same reason.

What the friend did was divide by 2. So the right answer is B.

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation: