Can someone help me with this one?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"