SOLUTION: if(x, -4) is a solution to the equation 4x - 5y =8, what is the value of x?

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Question 119801: if(x, -4) is a solution to the equation 4x - 5y =8, what is the value of x?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Since we have the solution (x,-4), this means y=-4.

4x-5y=8 Start with the given equation


4x-5%28-4%29=8 Plug in y=-4


4x%2B20=8 Multiply




4x=8-20Subtract 20 from both sides


4x=-12 Combine like terms on the right side


x=%28-12%29%2F%284%29 Divide both sides by 4 to isolate x



x=-3 Divide

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Answer:
So our answer is x=-3