Problema Solution
a number x is quadrupled another number y. Their difference is 6.
Answer provided by our tutors
x = 4y (1)
x - y = 6 (2)
subtitute x= 4y to (2) => 4y-y = 6 => 3y = 6 => y = 2
=> x = 2*4 = 8
=> x= 8 and y =2
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