anonymous
  • anonymous
Help please! Solve 2a − 5d = 30 for d. Show your work.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@peachpi
anonymous
  • anonymous
You have to move the 2a to the other side. It's added to -5d, so what operation do you have to use?
anonymous
  • anonymous
subtraction?

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anonymous
  • anonymous
right. so what do will you have after subtracting 2a from both sides of the equation?
anonymous
  • anonymous
do i subtract 2a from 5d or 30?
anonymous
  • anonymous
From the 30. It helps to line up like terms so you can see what cancel. |dw:1443035502144:dw|
anonymous
  • anonymous
a - 5d = 28a ? sorry I'm terrible at this :/
anonymous
  • anonymous
no worries. You can only combine terms with the same variable (aka like terms). So on the right side, you can't subtract 2 from the 30 because the 2 has an \(a\) and the 30 does not. So when you subtract, it's going to stay \(30-2a\). On the left side, you have two like terms \(2a\) and \(-2a\). When you subtract them you get \(0\). In the same way that \(2 - 2 = 0\), when you put variable there \(2a-2a=0\)|dw:1443036063501:dw|
anonymous
  • anonymous
so now all that's left is to divide by -5 because it's mulitplied by d.
anonymous
  • anonymous
|dw:1443036224256:dw|
anonymous
  • anonymous
thank you so much!! @peachpi
anonymous
  • anonymous
you're welcome

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