SOLUTION: hi i have the following problem and i need to know how to the check for my problem; 5x+7=-8 =5x+7-7=-8 - 7 =5/5 = 15/5 =1x + -3 = x = -3 so ho

Algebra ->  Exponents -> SOLUTION: hi i have the following problem and i need to know how to the check for my problem; 5x+7=-8 =5x+7-7=-8 - 7 =5/5 = 15/5 =1x + -3 = x = -3 so ho      Log On


   

Question 226241: hi i have the following problem and i need to know how to the check for my problem; 5x+7=-8
=5x+7-7=-8 - 7
=5/5 = 15/5
=1x + -3
= x = -3
so how do i check this?t
thanks,
Kristi
Found 2 solutions by jim_thompson5910, Alan3354:
Answer by jim_thompson5910(35256) About Me  (Show Source):
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5x%2B7=-8 Start with the given equation.


5x=-8-7 Subtract 7 from both sides.


5x=-15 Combine like terms on the right side.


x=%28-15%29%2F%285%29 Divide both sides by 5 to isolate x.


x=-3 Reduce.


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Answer:

So the solution is x=-3


So you are correct. Good job.


Here's how you check your answer:


5x%2B7=-8 Start with the given equation.


5%28-3%29%2B7=-8 Plug in x=-3


-15%2B7=-8 Multiply 5 and -3 to get -15


-8=-8 Add -15 to 7 to get -8


Since the equation is true, this verifies the answer.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
hi i have the following problem and i need to know how to the check for my problem; 5x+7=-8
=5x+7-7=-8 - 7
=5/5 = 15/5
=1x + -3
= x = -3
so how do i check this?
Sub -3 for x
5x+7 = -8
5*(-3) + 7 =? -8
-15 + 7 =? -8
-8=-8 so -3 is correct.