Question
the units of a number is 4 more than the tens digit. If the digits are reversed the new number is 1 less than twice the original number. Use a system of equations and substitution to find the number.
I'm stuck?!?!
I'm stuck?!?!
Answers
mwlevin
Let x be the units digit and y be the tens digit.
"The units of a number is 4 more than the tens digit"
x = y + 4
"If the digits are reversed the new number..."
The original number is x + 10y. The reversed number is 10x + y.
"...is 1 less than twice the original number."
10x + y = 1 + 2(x + 10y)
"The units of a number is 4 more than the tens digit"
x = y + 4
"If the digits are reversed the new number..."
The original number is x + 10y. The reversed number is 10x + y.
"...is 1 less than twice the original number."
10x + y = 1 + 2(x + 10y)