2.) 12, 15, 18, 11, 20, 9, 18, 20, 7, 10
Mean:
Median:
Mode:
Range:

i think the answer is b.

step-by-step explanation:

not 100% sure though.

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.