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bogdanovich [222]
3 years ago
13

Solve each system of equations by substitution: X + Y = 75 10x + Y = 48

Mathematics
1 answer:
Nimfa-mama [501]3 years ago
6 0

Answer:

X= -3;

Y=78

Step-by-step explanation:

A:       X+Y=75

B:       10X+Y=48

B-A:   (10X+Y)-(X+Y)=48-75

          10X+Y-X-Y= - 27

                       9X=-27

                         X= -3;

Now

A is :     -3+Y=75

                 Y=75+3=78

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An expression for the total cost of the daycare for Lucy's dog this week is T = 3F + 2H and the total cost is equal to $114.

<h3>How to write an expression for the total cost?</h3>

In this exercise, you're required to write an expression for the total cost of the daycare for Lucy's dog this week. Thus, we would assign a variable to the cost for full-day and half-day day care as follows:

  • Let the cost for full-day be F.
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Thus, the total cost of the daycare is given by:

T = 3F + 2H

Evaluating the expression, we have:

T = 3(28) + 2(15)

T = 84 + 30

T = $114.

Read more on expressions here: brainly.com/question/12189823

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2 years ago
Pat shows that 16 1/2= the square root of 16. What is one possible way pat could have shown this correctly?
kifflom [539]
<h3>Answer: Choice C</h3>

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Afterward, the exponents are added getting 1/2+1/2 = 2/2 = 1. The rule is a^b*a^c = a^{b+c} which only works if the bases are both the same.

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Answer:

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Step-by-step explanation:

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tigry1 [53]

Given cost function C(a) = 7.5a, where a is the number of T-shirts.

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