Can someone please help me with this?!!
and the first choose options are: linear or nonlinear

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

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)

Luke wants to reduce the area of his rectangular garden by 1/4 the expression 14/w can be used to represent this change. what is another way to write this expression?