What is the solution to this system of equations?

x − 2y = 15
2x + 4y = -18

y=-6 ;  x=3

Step-by-step explanation:

x − 2y = 15

2x + 4y = -18

x − 2y = 15

  +2y .   +2y

x=2y+15

2(2y+15) + 4y = -18

4y+30+4y=-18

8y+30=-18

    -30 .  -30

8y=-48

y=-6

x=2(-6)+15

x=-12+15

x=3

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation:

ok thats very interesting