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MArishka [77]
2 years ago
8

In a two digit number, the tens digit is 2 less than the units digit multiplied by three. The reversed number is half the origin

al number plus 1/2. What is the origional number.
Pls Help. Offering 40 points!
Mathematics
1 answer:
Papessa [141]2 years ago
8 0

Answer:

73

Step-by-step explanation:

Original number: XY

x = 3y - 2

10y + x = (10x + y) / 2 + 1/2

substitution: 10y + 3y - 2 = 13y - 2 = (10 * (3y - 2) + y) / 2 + 1/2

* 2 both sides and simplify: 26y - 4 = 31y - 19

31y - 26y = -4 + 19

5y = 15

y = 3

x = 7

Original number: 73

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