SOLUTION: Please help me to solve this equation/problem: 21-y=2y
I know that y=7 but my teacher said I have to show working and I don't know how to do this.
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-> SOLUTION: Please help me to solve this equation/problem: 21-y=2y
I know that y=7 but my teacher said I have to show working and I don't know how to do this.
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Question 772395: Please help me to solve this equation/problem: 21-y=2y
I know that y=7 but my teacher said I have to show working and I don't know how to do this.
You can put this solution on YOUR website! You want all terms of y on one side of the equal sign and all constants on the other side of the equal sign. The simplest way is like this:
Equation given is the same as 21+(-y)=2y
Add the additive inverse of (-y) to both sides.
Combine like-terms of y.
Multiply both sides by the multiplicative inverse of the factor attached to the y term.
Simplify if needed.
Finished.
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