# extra help please?

How do you cross multiply

4c + 12 = 3d + 9

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- sepiaLv 72 months ago
4c + 12 = 3d + 9

This being an equation,

no cross multiplication is involved.

Factorizing gives us

4(c + 12) = 3(d + 3)

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- Anonymous2 months ago
The equation has already been cross-multiplied...

4c + 12 = 3d + 9 ==> 4(c + 3) = 3(d + 3).

The original equation (before cross-multiplication) would be: (c + 3)/3 = (d + 3)/4.

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- Anonymous2 months ago
Simplify the equation: 4(c +3) = 3(d+3)

Now try.

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- ElaineLv 72 months ago
Are you trying to rewrite one variable in terms of the other?

4c = 3d + 9 - 12

4c = 3d - 3

c = 3d - 3/4

OR

4c + 12 - 9 = 3d

4c + 3 = 3d

4c/3 + 3/3 = d

4c/3 + 1 = d

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- Jim MoorLv 72 months ago
I never cross multiply, it's too confusing! But you can simplify.

4(c +3) = 3(d+3)

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- 冷眼旁觀Lv 72 months ago
(4c + 12)/1 = (3d + 9)/1

(4c + 12) × 1 = (3d + 9) × 1

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- Donnie PorkoLv 72 months ago
You can’t. You need fractions to cross multiply.

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- Anonymous2 months ago
What are you trying to do?

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