6+9k+5j=54. i've subtracted 6 on both sides and now i have 9k+5j=48. what now?

Use the diagonals to determine whether a parallelogram with vertices u(2,−2), v(9,−2), w(9,−6), and x(2,−6) is a rectangle, rhombus, or square. give all the names that apply.

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

What is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units