Pls help me with this pls :)

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

What expression is equivalent to 42x-56y

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.