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Dearey
Mathematics
3 May, 01:17
If x+7=2y and y=2x-1, what is the value of y?
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Sterling Patrick
3 May, 01:37
0
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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