Ordered pairs

Question

the ordered pair (x,y) satisfies the system of equations: 2y-x=-7

                               X+2y=3

what is the value of 4y?

Answer 1

Natalie, if we add these two equations together, the x and -x cancel out, 2y + 2y = 4y, and -7 + 3 = -4, sooooo 4y = -4.

 

Hope this helps!