Question

The sum of the digits of a 2-digit number is 12. The number is 6 times the unit digit. Find the number.
Plz it's urgent.
Step-by-step explanation plz plz..​

Answer 1

Answer:

48

Step-by-step explanation:

let digits be x and y and number be xy

x+y=12

number =10x+y

10x+y=6(y)

10x-5y=0----1

x+y=12-----2

10x-5y

10x+10y=120

subtract

10x+10

-10x-5y

------------- 10y-(-5y)=15y

15y

---------------------------------

=15y=120

y=8

x=4

so number is 48

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it is linear equation in 2 variable multiply (x+y) with 10 to make variable equal subtract it to get it in one variable after getting value of y

x+y=12

x+8=12

x=4

and we know y= unit place

so 48

in 2 variables we generally represent number as 10x+y for example x=4 y=8. 10x+y=40+8=48

if you not understood now also see videos on it on linear equation in 2 variables and question on number identification as subtopic of linear equations in 1 and 2 variables

plz mark this answer as brainliest short of one brainliest to get genius rank.