Question

In a 2 digit no. the unit's digit is x & the 10's digit is y then no. is​

Answer 1

Answer:

Let the tens digit be x and the units digits be y. Then the number will be 10x + y.

We are told that the units digit is twice the tens digit. This fact can be written as:

y - 2x = 0 ________________________(1)

We are also that if 18 is added to the number, the digit interchange their places. This fact can be written as:

(10x + y) + 18 = 10y + x

or, 9x - 9y = -18

or, x - y = -2 ________________________(2)

On adding the two equations (1) and (2),

y - 2x + x - y = -2

-x = -2

x = 2

y = 2x = 2 × 2 = 4

Therefore, the number is 24.

hope it helps you ✅✅✅

Answer 2

Answer:

sᴜᴘᴘᴏsᴇ ᴏᴜʀ ɴᴜᴍʙᴇʀ ɪs .ɪᴛ ʜᴀs ᴀᴛ ᴜɴɪᴛs ᴅɪɢɪᴛ ᴀɴᴅ ᴀs ᴛᴇɴs ᴅɪɢɪᴛ

sᴏ ᴄᴀɴ ʙᴇ ᴡʀɪᴛᴛᴇɴ ᴀs ×+

sɪᴍɪʟᴀʀʟʟʏ ᴀɴʏ ᴅɪɢɪᴛ ɴᴜᴍʙᴇʀ sᴀʏ 'ʏx' ᴡɪᴛʜ x ᴀᴛ ᴜɴɪᴛs ᴅɪɢɪᴛ ᴀɴᴅ ʏ ᴀs ᴛᴇɴs ᴅɪɢɪᴛ ᴡʜɪᴄʜ ᴄᴀɴ ʙᴇ ᴡʀɪᴛᴛᴇɴ ᴀs x+ʏ

ᴀɴᴏᴛʜᴇʀ ᴀᴘᴘʀᴏᴀᴄʜ ɪs sᴀʏ ᴏᴜʀ ɴᴜᴍʙᴇʀ ɪs ʏx ᴛʜᴇɴ ʙʏ ᴅɪᴠɪᴅɪɴɢ ɪᴛ ᴡɪᴛʜ ᴡᴇ ɢᴇᴛ ʀᴇᴍᴀɪɴᴅᴇʀ x ᴀɴᴅ ǫᴜᴏᴛɪᴇɴᴛ ᴀs ʏ

sᴏ ᴡᴇ ᴋɴᴏᴡ ᴛʜᴀᴛ ᴅɪᴠɪᴅᴇɴᴅ=ᴅɪᴠɪsᴏʀ×ǫᴜᴏᴛɪᴇɴᴛ+ʀᴇᴍᴀɪɴᴅᴇʀ

sᴏ xʏ=×ʏ+x