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
