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arlik [135]
4 years ago
10

When Devon cashed a $450 check at the bank, the teller gave him 18 bills, all $20 bills and $50 bills. Which system of equations

can be used to find how many of each type of bill Devon received?
Mathematics
1 answer:
Jet001 [13]4 years ago
6 0
Let, the number of $20 bill = x
number of $50 bill = y

Equations would be: x + y = 18
& 20x + 50y = 450

Substitute value of x from 1st equation into 2nd equation;
20(18-y) + 50y = 450
360-20y + 50y = 450
30y = 450-360
y = 90/30
y = 3

Now, Substitute value of y in 1st equation, 
x + 3 = 18
x = 18 - 3 = 15

So, There were 15 bills of $20 and 3 bills of $50

Hope this helps!
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Step-by-step explanation:

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Emmanuel added two integers Which condition will always give Emmanuel a negative solution when he adds two integers? Both intege
alexgriva [62]

Both integers have negative values

Explanation

Let

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\begin{gathered} +\text{   +     +} \\ +\text{  +      -} \\ -\text{     +     +} \\ -\text{   +-} \end{gathered}

a) Both integers have negative values Both integers

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b) Both integers have positive values

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I hope this helps you

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2 years ago
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Step-by-step explanation:

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7 0
3 years ago
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3 years ago
Marcus invested $2000 in a bank account earning simple interest. The interest, I, he has after t years at an interest rate r is
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Answer:

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Step-by-step explanation:

<h3>Given</h3>

<u>The equation for simple interest:</u>

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Read 2 more answers
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