How do I solve this problem

-2x+9y=15
x+7=4

Linet passes through (4.5) and is perpendicular to the line shown on the condirate grid.what is the equation of line t in standard form?

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=