Solve each system of equations by substitution
-3v+3x=12
3v-6x=-21

- anonymous

Solve each system of equations by substitution
-3v+3x=12
3v-6x=-21

- katieb

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- tkhunny

1) Divide EVERYTHING by 3.

- skullpatrol

$$-3v+3x=12$$
$$3v-6x=-21$$
$$\frac{1}{3}(-3v+3x)=\frac{1}{3}(12)$$
$$ \frac{1}{3} (3v-6x)=\frac{1}{3}(-21)$$

- skullpatrol

Dividing by 3 is the same as multiplying by 1/3 right? @overtonka

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## More answers

- anonymous

I really don't know how to do this o.o

- skullpatrol

The multiplication property of equality allows you to multiply both sides of an equation by the same nonzero number and get an equivalent equation. Have you heard of this property in class?

- skullpatrol

@overtonka

- anonymous

No I havent

- skullpatrol

Let me give you an example let's say 3=3, now I multiply both sides by 2 what would I get?

- skullpatrol

@overtonka

- anonymous

do u want the answer or how to get the answer

- ryan123345

To atleast make the question easier divide everything by 3

- anonymous

I tried that

- ryan123345

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- skullpatrol

@overtonka Does giving you the answer help you learn?

- skullpatrol

Do you want to learn how to do this?

- ryan123345

|dw:1361972609881:dw|

- ryan123345

|dw:1361972653183:dw|

- skullpatrol

You must first understand why you do the steps @overtonka

- ryan123345

|dw:1361972684025:dw|

- skullpatrol

ryan will give you the answer .. I can show you how to do it ...you choose

- ryan123345

|dw:1361972804662:dw|

- skullpatrol

Being interested in how and why things work is what math is all about

- skullpatrol

Do you want to learn how to do this?

- skullpatrol

Why the steps work?

- anonymous

Ryan is showing how to do it, he's not just giving answers

- ryan123345

Thank you.

- skullpatrol

Let the learner decide.

- anonymous

ok, @overtonka , do you like the way skullpatrol does it or the way Ryan answers

- Callisto

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- ryan123345

Okay sorry dude

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