Determine 18613

A number twice less than y is 12 less than y. Determine the size of the number y.

Correct answer:

y =  24

Step-by-step explanation:


x = y-12
x = y/2

x-y = -12
2x-y = 0

Pivot: Row 1 ↔ Row 2
2x-y = 0
x-y = -12

Row 2 - 1/2 · Row 1 → Row 2
2x-y = 0
-0.5y = -12


y = -12/-0.5 = 24
x = 0+y/2 = 0+24/2 = 12

x = 12
y = 24

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