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natita [175]
3 years ago
6

What math properties are these equations?

Mathematics
1 answer:
gulaghasi [49]3 years ago
7 0
Hmm. This is a bit difficult, but they all have to do with multiplication. The first and third equations have to belong to commutative property of multiplication, because you can switch the order of them and still get the same answers. The second question would be associative property of multiplication, because there are parenthesis around two numbers and you can move the parenthesis without switching the order of the numbers, while still getting the same answer.
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Multiply each equation by a constant that would help to eliminate the y terms.
Zinaida [17]

Answer:

Therefore the required resulting equation is

6x-15y=-63\\-15x+15y=90

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Step-by-step explanation:

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2x-5y=-21         ......................Equation ( 1 )

3x-3y=-18         ......................Equation ( 2 )

To Find:

Expression after multiplying to eliminate y term,

Solution:

So to eliminate 'y' term we need to multiply equation 1 by a constant 3 and equation 2 by a constant -5,  such that equations  becomes

3(2x-5y)=3\times -21\\\\6x-15y=-63 .....( 1 )

-5(3x-3y)=-5\times -18\\\\-15x+15y=90  .....( 2 )

so now by adding new equation one and two we can eliminate y term that means -15y and +15y will get cancel,

Therefore the required resulting equation is

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