Question 107211
Your error occured when you multiplied the equation by 2.5.
You have:
2.5(2x+5y = 4) = 5x+7.5y = 10 but 2.5(5y) = 12.5y, so the result should have been:
5x+12.5y = 10 now when you subtract the other equation:
5x-7y = -29 you get:
19.5y = 39 Dividing both sides by 19.5 gives you:
y = 2