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MArishka [77]
3 years ago
6

Solve the system of equations by substituting 15x+31y=−3 x=−y+3 ​

Mathematics
2 answers:
alekssr [168]3 years ago
6 0

Answer:

x=6   y=-3

Step-by-step explanation:

Angelina_Jolie [31]3 years ago
4 0

Answer:

x=6

y=-3

Step-by-step explanation:

Substitute (-y + 3) for x in the first equation:

15(-y+3)+31y=-3

Expand:

45-15y+31y=-3

Simplify:

45+16y=-3

Subtact 45 from both sides:

16y=-48

Divide both sides by 16:

y=-3

Substitute -3 for y in either equation:

x=-(-3)+3

x=6

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irina [24]

Answer:

The function is represented by C(d) = 75\,USD + r\cdot d.

Step-by-step explanation:

In this case, we must observe that total cost of the dog (C(d)) is the sum of two components: i) <em>Fixed cost</em> (C_{f}) - Adoption fee, ii) <em>Variable cost</em> (C_{v}) - Daily cost of feeding the dog, both measured in US dollars.

In addition, we suppose that variable cost is directly proportional to the number of days that Kirstin owns her dog. That is:

C (d) = C_{f} + C_{v}

C(d) = C_{f} + r\cdot d

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If C_{f} = 75\,USD, then:

C(d) = 75\,USD + r\cdot d

The function is represented by C(d) = 75\,USD + r\cdot d.

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3 years ago
Simplify 16 + 5.6 + 0.681​
Masja [62]

Step-by-step explanation:

16+5.6+0.681=22.281

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Step-by-step explanation:

To find the answer to this question, you would need to multiply 15 times .49 which would equal 7.35

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