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Romashka-Z-Leto [24]
3 years ago
9

Xy+4y=3x-2, show that y is a function of x

Mathematics
2 answers:
zepelin [54]3 years ago
6 0
(xy+4y)/x = (3x-2)/x
(y+4y)/x = (3x-2)/x divide both side by x
5y /x = (3x-2)/x
5y= 3x-2 Mult by x both side
y= (3x-2)/5
Ede4ka [16]3 years ago
5 0
Basically, solve for y

first undsitribute y
y(x+4)=3x-2
divide both sides by x+4
y=\frac{3x-2}{x+4}
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Answer:

25 questions

Step-by-step explanation:

At a math competition 2 students can answer 40 questions in 1 hour.

Therefore, 1 student can answer in 1 hour =  \frac{40}{2}

                                                                     = 20 questions

5 students can answer in 1 hour = 20 × 5 = 100 questions

60 minutes = 1 hour

15 minutes =  \frac{15}{60} = 0.25 hours

5 students can answer in 0.25 hours = 100 × 0.25

                                                              = 25 questions

5 students could answer 25 questions in 15 minutes.

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