Question 23140
Elimination:
1st: 2x+3y=-16
2nd: 5x-10y=30
Multiply 1st by 5 and 2nd by 2 to get the following:
1st: 10x+15y=-80
2nd: 10x-20y=60
Now subtract the 2nd from the 1st to eliminate the x's:
    35y = -140
      y =  -4
Substitute that value of "y" into the original 1st
equation to solve for "x":
  2x+3(-4)= -16
  2x-12 = -16
      x = -2
Check this answer of x=-2 and y=-4 in the 2nd original equation:
  5(-2)-10(-4)= 30
  -10+40 = 30
      30 = 30

Cheers,
Stan H.