Question

A number consists of two digits whose sum is 7. If 45 is added to the number, the digits are reversed . Find the number .

Answer 1

Answer:

X+y=9

10x+y-45=10y+x

solve it an algebra now

Step-by-step explanation:

X+y=9

10x+y-45=10y+x

x+y=9....(1)

10x-x+y-10y=45

9x-9y=45

9(x-y)=45

x-y=45

-----

x+y=9

x-y=5

2x=14

x=7

your turn finish it

7+y=9

y=9-7

y=2

the number is 72

Answer 2

Answer:

x=2 , y=5

Step-by-step explanation:

x+y=7 ---> eq 1

x+y=7+45

x+y=52

since numbers are reversed x = 2 y=5