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True [87]
3 years ago
12

Sam earned $130 last week. Jay earned $150 last week. They combined their money and decided to donate 1/5 of their total amount

to help the hurricane victims. They, they spent 30% of the remaining amount at a video game store. Jay claims that they have 50% of their original combined total left. Is Jay's claim correct?
Mathematics
1 answer:
defon3 years ago
4 0
Jay's claim is false. They would have $156.8 left which is 56% of their original combined total. 
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Combine 2y+1x=40 and y=2x using substitution
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2(2x) + 1x = 40 or 4x + 1x = 40 is the result of combining by substitution

<em><u>Solution:</u></em>

Given that we have to combine 2y + 1x = 40 and y = 2x using substitution method

The substitution method for solving systems of equations involves expressing one variable in terms of another, thus removing one variable from an equation.

<em><u>Given equations are:</u></em>

2y + 1x = 40 -------- eqn 1

y = 2x ----------- eqn 2

We can substitute eqn 2 in eqn 1

Which means, substitute y = 2x in place of y in eqn 1

2(2x) + 1x = 40

4x + 1x = 40

5x = 40

x = 8

From eqn 2,

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y = 16

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