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Mathematics 13 Online
OpenStudy (anonymous):

Which step should be completed first to solve the equation 8x - 12 = 13? A. Add 12 to both sides. B. Add 13 to both sides. C. Divide both sides by 8. D. Subtract 13 from both sides. x= ?

OpenStudy (igreen):

You're missing the equation.

OpenStudy (anonymous):

one sec

OpenStudy (igreen):

Okay.

OpenStudy (igreen):

12 is being subtracted in the equation, we must do the opposite to keep the balance, and what's the opposite of subtraction?

OpenStudy (anonymous):

What is the inverse operation of subtracting is adding, and the inverse operation of multiplying is dividing.

OpenStudy (anonymous):

Addition.

OpenStudy (igreen):

"What is the inverse operation of subtracting is adding, and the inverse operation of multiplying is dividing." Makes no sense^^

OpenStudy (igreen):

Yes, so what are we going to do to 12?

OpenStudy (anonymous):

add it to 13?

OpenStudy (igreen):

Yes! We add it to both sides.

OpenStudy (anonymous):

Yea

OpenStudy (anonymous):

Thanks

OpenStudy (igreen):

Adding 12 to both sides will cancel out - 12, and you add it to 13.

OpenStudy (igreen):

Oh, and btw, we add 12, and not subtract 13, because 12 is with our variable(x), so we want to get rid of the number that's with the variable.

OpenStudy (anonymous):

So the answer A

OpenStudy (igreen):

Yep.

OpenStudy (anonymous):

Thanks.

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