AHH HELP-

solve for y.
-2x + y = 5

what does y equal and how did you solve it?

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.