Can you guys help??!

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10