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mart [117]
3 years ago
12

The value of y varies directly with x. If x = 15, then y = 12. What is the value of y, when x = 21?

Mathematics
2 answers:
pentagon [3]3 years ago
8 0

Answer:

The answers A

Step-by-step explanation:

Use ratios such that x1/y1= x2/y2

Need to find x2

So it works much easier if you use x as the numerator, giving 15/12=x/21

Multiply both sides by 21 and we have 21 x 15/12=x x 21/21

and 21/21=1 giving: x=21 x 15/12= 26 1/4

and in decimal form is 26.25

spin [16.1K]3 years ago
7 0

Answer:

Step-by-step explanation:

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At the bank, Derek made 7 withdrawals, each in the same amount. His brother, John, made 5 withdrawls, each in the same amount.

Let x be  the amount of one of Derek's withdrawals

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x + 5 is t the amount of one of John's withdrawals

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So amount withdraw 7 times = 7x

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So amount withdraw 5 times = 5(x+5)

Both Derek and John withdrew the same amount of money in the end

(A) 7x = 5(x+5)

(B) Solve for x

7x = 5x + 25

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2x = 25

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(C) check your solution

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7(12.5) = 5(12.5) + 25

87.5 = 62.5+ 25

87.5 = 87.5

(D) Each brother withdrawal 87.5 dollars



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Step-by-step explanation:

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