this question forces you to use elimination.
To use elimination, you line up the x^2, x, and number, which is done for you in the question.
So let's work through the steps:
-5y - 10x = 45
-3y + 10x = -5
As you can see, the x's cancel each other out. So go from up to down to add the numbers together.
-8y = 40
-5y+ -3y = -8y and 45 + -5 = 40 and -10x + 10x = 0. So this is how we get the equation above.
y=-5
40 divided by -8 = -5. We found the y, now we can go for the x by substituting this to one of the equation.
-5(-5)- 10x =45
25-10x = 45
10x = 20
x=2
so y=-5 and x=-2.
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