You are given a 2 digit number. 7 times its tens digit plus 6 times its ones digit is equal to 75;
8 times its tens digit minus 1 times its ones digit is equal to 15. What is the number ?

- anonymous

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- myininaya

sometthing here
let x be the 10's digit
let y be the 1's digit
7x+6y=75
what's the other equation?

- anonymous

wouldnt it be :
8x - 1 = 15?
Wait that might be totally wrong.. :P

- anonymous

ok but does anyone know the answer?

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## More answers

- myininaya

i did the last problem for you. shouldn't you learn how to do then for me to give you the answers

- anonymous

i just need one more example

- myininaya

close I

- myininaya

fun is close help her with the equation should put down

- anonymous

oh ^^ thx i figured it wasnt totally rite :P lol and call me dolly!!

- myininaya

shes missing one little thing

- anonymous

?

- myininaya

what does y represent?

- anonymous

the answer

- myininaya

above i said let y represent the 1's digit remember?

- anonymous

ohh ok

- myininaya

8 times its ten's digit minus 1 times its one's digit is equal to 15 its one's digit in symbols is...
8 * x - 1 * y = 15

- myininaya

8x-y=15

- anonymous

so the answer is y= 8x+25

- anonymous

so what is the answer?

- myininaya

we haven't got there yet
we have two equations 8x-y=15 and 7x+6y=75

- anonymous

ok

- myininaya

try to solve that first one for either x or y and let me know what you come up with

- anonymous

y=8x-15

- myininaya

good now plug that into the y in the other equation
so you would 7x+6(_________)=75 what goes in that blank?

- anonymous

7x+42-90=75

- myininaya

7x+6(8x-15)=75
7x+48x-80=75 now see if you can solve this for x

- anonymous

55x=155

- anonymous

the answer is 3

- anonymous

you made a mistake 6 times 15 is 90

- anonymous

is that the correct answer?

- myininaya

ok then it would be 55x=165 which would make x=3

- myininaya

but thats the 10's digit
whats the one's digit

- anonymous

its 39

- myininaya

so if x=3, then y=8(3)-15=24-15=9
so yes the answer is 39

- radar

myininaya just received a medal from radar

- anonymous

radar just recieved a medal from dolly!!

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