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14-06-2019
Mathematics

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If x+7=2y and y=2x−1, what is the value of y?

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Аноним Аноним

14-06-2019

Answer:

y = 5

Step-by-step explanation:

x + 7 = 2y ... (i)

y = 2x - 1 ... (ii)

x = 2y - 7 ... (i)

y = 2x - 1 ... (ii)

Replacing x in (i) into the x in (ii) we get:

y = 2(2y - 7) - 1 ... (ii)

y = 4y - 14 - 1

3y = 15

y = 15/3 = 5

So y = 5 and x = 2(5) - 7 = 3

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