Question

Using the equation you found for “7 less than the product of 3 and x is equal to x increased by 15” and the values x = 8, 11, 15, showing work for all three values, tell which is a solution and which is not a solution to the equation.
@OrangeMaster

Answer 1

7 - 3x = x +15

Answer 2

Just substitute x = 8 then x = 11 ten x = 15
check whether the equality will satisfy then you can conclude that it is a solution, if not, then is is not a solution

for example, right we have 7-3x = x + 15
if we let x = 8
7 - 3(8) = 8 + 15
7 - 24 = 23
-17 = 23 --> this not satisfy the equality, therefore, it is not a solution

try for the other two!

Answer 3

I think that I might have messed up and it's:

3x-7=x+15

Answer 4

Using 8:

(3*8)-7=8+15
24-7=23
17=23......Not correct
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Using 11:

(3*11)-7=11+15
33-7=26
26=26.......CORRECT
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Using 15:

(3*15)-7=15+15
45-7=30
38=30......Not correct

Answer 5

Sorry about getting the first part wrong. It was a tip-off when it didn't work for any of the values. But, my last two comments are correct.