Here are janet's steps for solving the system below by eliminating x.
2x + 3y = -1 5x + 8y = 0
step one: multiply the first equation by 5. 10x + 15y = -5
step two: multiply the second equation by -2. -10x - 16y = 0
step three: add the two equations. y = -5 step
four: substitute y back into the first equation. 2x + 3(-5) = -1
step five: solve for x. 2x - 15 = -1 2x = 14 x = 7 is she correct? justify your answer. if incorrect, describe the error.