anonymous
  • anonymous
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 ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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myininaya
  • 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
  • anonymous
wouldnt it be : 8x - 1 = 15? Wait that might be totally wrong.. :P
anonymous
  • anonymous
ok but does anyone know the answer?

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More answers

myininaya
  • myininaya
i did the last problem for you. shouldn't you learn how to do then for me to give you the answers
anonymous
  • anonymous
i just need one more example
myininaya
  • myininaya
close I
myininaya
  • myininaya
fun is close help her with the equation should put down
anonymous
  • anonymous
oh ^^ thx i figured it wasnt totally rite :P lol and call me dolly!!
myininaya
  • myininaya
shes missing one little thing
anonymous
  • anonymous
?
myininaya
  • myininaya
what does y represent?
anonymous
  • anonymous
the answer
myininaya
  • myininaya
above i said let y represent the 1's digit remember?
anonymous
  • anonymous
ohh ok
myininaya
  • 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
  • myininaya
8x-y=15
anonymous
  • anonymous
so the answer is y= 8x+25
anonymous
  • anonymous
so what is the answer?
myininaya
  • myininaya
we haven't got there yet we have two equations 8x-y=15 and 7x+6y=75
anonymous
  • anonymous
ok
myininaya
  • myininaya
try to solve that first one for either x or y and let me know what you come up with
anonymous
  • anonymous
y=8x-15
myininaya
  • myininaya
good now plug that into the y in the other equation so you would 7x+6(_________)=75 what goes in that blank?
anonymous
  • anonymous
7x+42-90=75
myininaya
  • myininaya
7x+6(8x-15)=75 7x+48x-80=75 now see if you can solve this for x
anonymous
  • anonymous
55x=155
anonymous
  • anonymous
the answer is 3
anonymous
  • anonymous
you made a mistake 6 times 15 is 90
anonymous
  • anonymous
is that the correct answer?
myininaya
  • myininaya
ok then it would be 55x=165 which would make x=3
myininaya
  • myininaya
but thats the 10's digit whats the one's digit
anonymous
  • anonymous
its 39
myininaya
  • myininaya
so if x=3, then y=8(3)-15=24-15=9 so yes the answer is 39
radar
  • radar
myininaya just received a medal from radar
anonymous
  • anonymous
radar just recieved a medal from dolly!!

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