Question

the sum of the digits of a certain two-digit number is 7. Reversing its digits increases the number by 9. What is the number? how do you solve it? ( systems of equations )

Answer 1

Find what equals to 9

09
18
27
36
45
54
63
72
81
90

Then find which equals 7

Answer 2

Sorry, reverse.

Answer 3

As you can see, each go to 9, meaning, you can find which number it is by looking at 1-9 (81 - 82 - 83 -84 ..none of which equal 7)

Answer 4

34 :)

Answer 5

thanks :)

Answer 6

everyone