Question

{2x+5y=-4
{4x-5y=22
what is the solution to the above system of equation

Answer 1

look at the y's.. if you add these two equations together the y's will cancel out.

2x+5y=-4
4x-5y=22
+
------------
= 6x+0y=18

now x=18/6 = 3.

now sub 3 back into any of the two equations to find y, so 2(3)+5y=-4
6+5y=-4
5y=-10
y=-10/5 = -2

Answer 2

thank you so much!!!!

Answer 3

this is both, you can start with eliminating one variable