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Sauron [17]
3 years ago
13

1/5x-2/3y=30 What is the value of the x in the equation when y=15

Mathematics
2 answers:
svetlana [45]3 years ago
8 0

Answer:

\frac{1}{5} x -  \frac{2}{3} y = 30 \\  \frac{1}{5} x -  \frac{2}{3} 15 = 30 \\  \frac{1}{5} x -  \frac{30}{3}  = 30 \\  \frac{1}{5} x  -  10 = 30 \\  \frac{1}{5} x = 30 + 10 \\  \frac{1}{5} x = 40 \\ x = 40 \div  \frac{1}{5}  \\ x = 40 \times  \frac{5}{1}  \\ x = 40 \times 5 \\ x = 200

I hope I helped you^_^

cestrela7 [59]3 years ago
8 0

Answer:

x = 200

Step-by-step explanation:

1/5x-10=30 (2/3y will equal 10 if it y=15)

Add 10 on both sides

1/5x=40

Times 5 on both sides

x = 200

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Sally bought some candy bars for $1.25 each and some sodas for $1.49 each. If she bought a total of 38 items and spent $50.38 ho
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Answer:

26 candy bars and 12 sodas

Step-by-step explanation:

This problem can be solved by a simple system of equations

I am going to call x the number of candy bars that Sally bought and y the number of sodas that Sally bought.

The fact that she bought 38 itens means the x + y = 38.

She spent $50.38. The value she spent is the sum of the number of candy bars multplied by the value of the candy bar and the number of sodas multiplied by value of a soda. So 1.25x + 1.49y = 50.38

So we have to solve the following system:

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From 1), we have that x = 38 - y. I am going to replace it in 2)

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2 years ago
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