Help on just these ol​

What is the value of x? enter your answer in the box. photo attached.

(08.01)consider the following pair of equations: x + y = −2 y = 2x + 10 if the two equations are graphed, at what point do the lines representing the two equations intersect? (−4, 2) (4, 2) (−2, 4) (2, 4)

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?