Answer:
A. x=4 y=11
Step-by-step explanation:
y=x+7
y=-2(y-7)+19
y=-2y+14+19
y=-2y+33
y+2y=33
y(1+2)=33
y=33/3
y=11
x=4
This is how you find the mean of a number:
To find the mean of a number, you need to add up all the numbers listed (so, 5, -11, 7, 12, -1 and 0) and then divide it by the amount of numbers there are listed. 5 + -11 + 7 + 12 + -1 + 0 equals 12, and since there are 6 numbers you then divide 12 by 6. 12 divided 6 is 2.
So the answer is A. I hope this helped you!