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aleksley [76]
3 years ago
8

Solve the system by substitution. 5x+2y= 5 y=-2x + 3

Mathematics
1 answer:
Mamont248 [21]3 years ago
3 0
5x+2(-2x+3)=5
5x-4x+6=5
x=-1

Then plug back into either to solve for y.

y=-2(-1)+3
y=2+3
y=5

Substitution means you just replace one variable with the other equation so only one variable is showing. That’s how you solve for the first variable.
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Let:

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The total cost of the mix is, therefore: 0.8x + 10 dollars.

We are also given the pound of mix costs $1.00 and we have a total of 8 + x pounds, so the total cost of the mix is 1*(8 + x) dollars.

Equating both costs:

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0.8x + 10 = 8 + x

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Answer:

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