Perimeter cm, area square cm

Find the value of the variable and the length of each secant segment.

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)

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.