Question 189434: This problem was given in a packet of problems from a teacher preparation program I am currently undertaking. If (-3.5, y) is a solution to the equation 2x-5y=10, what is the value of y? I have the answer in an answer key is -0.6, but do not know how to figure this one out, please help by showing your steps. Thank you, Ruby
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! If (-3.5, y) is a solution to the equation 2x-5y=10, what is the value of y?
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The provided point (-3.5, y) gives the a value of 'x' as -3.5
Substitute that into the given formula and solve for y:
2x-5y=10
2(-3.5)-5y=10
(-7)-5y=10
Adding 7 to both sides:
-5y=17
Finally, dividing both sides by -5:
y = -17/5
y = -3.4
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Check
your answer sheet -- are you sure you provided the right answer from the book?
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