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 ?

Question

myininaya · Answer

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 · Answer

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

anonymous · Answer

ok but does anyone know the answer?

myininaya · Answer

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

anonymous · Answer

i just need one more example

myininaya · Answer

close I<fun

myininaya · Answer

fun is close help her with the equation should put down

anonymous · Answer

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

myininaya · Answer

shes missing one little thing

anonymous · Answer

?

myininaya · Answer

what does y represent?

anonymous · Answer

the answer

myininaya · Answer

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

anonymous · Answer

ohh ok

myininaya · Answer

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 · Answer

8x-y=15

anonymous · Answer

so the answer is y= 8x+25

anonymous · Answer

so what is the answer?

myininaya · Answer

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

anonymous · Answer

ok

myininaya · Answer

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

anonymous · Answer

y=8x-15

myininaya · Answer

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

anonymous · Answer

7x+42-90=75

myininaya · Answer

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

anonymous · Answer

55x=155

anonymous · Answer

the answer is 3

anonymous · Answer

you made a mistake 6 times 15 is 90

anonymous · Answer

is that the correct answer?

myininaya · Answer

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

myininaya · Answer

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

anonymous · Answer

its 39

myininaya · Answer

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

radar · Answer

myininaya just received a medal from radar

anonymous · Answer

radar just recieved a medal from dolly!!