fideldiazidea
21.07.2019 •
Mathematics
The sum of the digits of a two-digit number is 16. if the digits are reversed, the new number is 18 less than the original number. find the original number.
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Ответ:
Let one digit be x
Let the other digit = y
x + y = 16
Let the original number = 10x + y
Let the reverse number = 10y + x
10x + y - 18 = 10y + x
Comment
Bring the letters to the left and the number 18 to the right.
10x - x + y - 10y = 18 Combine like terms.
9x - 9y = 18 Divide both sides by 9
x - y = 2
Set up a set of equations and add.
x + y = 16
x - y = 2 Now add
2x = 18 Divide by 2
x = 18/2
x = 9
x + y = 16
9 + y = 16 Subtract 9 from both sides.
y = 16 - 9
y = 7
Check
Original number = 97
Reversed number 79
Difference 18 and it checks.
Ответ:
see below
Step-by-step explanation:
An exponential term with a base greater than 1 will increase at an increasing rate. If the base is less than 1 (a fraction), then it will decrease at a decreasing rate.
Any (non-zero) base to the 0 power will have a value of 1, so the function will have a y-intercept at (0, 1) if there is no multiplier (vertical scale factor) of the exponential factor. The y-intercept will be the value of the multiplier.
__
y-intercept at (0,1)
graph initially decreases rapidly and then decreases slowly
__
y-intercept at (0,5)
graph initially decreases rapidly and then decreases slowly
__
y-intercept at (0,1)
graph initially increases slowly and then increases rapidly