Question

t+u=9
10t+u+u=24, solve to fins t and u

Answer 1

:/ if you really want to learn here you should take the advise I gave you in the previous question: http://openstudy.com/updates/4fe2457be4b06e92b87139bf

Answer 2

yeah i saw the video

Answer 3

there is more than one video there...

Answer 4

that site also has a section with sample questions to practice on.

Answer 5

oh really did't know that

Answer 6

thing is that i need to turn in the problem in 20 min..that's why I wanted someone to teach me real quick..u know what i mean?

Answer 7

I know it can be frustrating at the start, but you put in some time to practice first then the rewards will be big for you. :)

Answer 8

yeah you are right

Answer 9

ok, because you are cooperating here, I will do you a favour and show you how this particular one is done in the hope that you learn something :)

Answer 10

ok thank you very much! :)

Answer 11

so, we had these equations to solve:

t+u=9
10t+u+u=24

the first step was to look at just the first equation which is:

t + u = 9

now, lets subtract u from both sides:

t + u - u = 9 - u which leads to:
t = 9 - u

understand so far?

Answer 12

ok, yes i do

Answer 13

good, so now we just need to substitute this expression for t into the second equation which was:

10t + u + u = 74 to get:
10(9 - u) + u + u = 74 expanding this we get:
90 - 10u + u + u = 74 then collect the terms involving u to get:
90 - 8u = 74 now lets add 8u to both sides to get:
90 - 8u + 8u = 74 + 8u which simplifies to:
90 = 74 + 8u now subtract 74 from both sides to get:
90 - 74 = 74 + 8u - 74 which simplifies to:
16 = 8u now divide both sides by 8 to get:
2 = u

Answer 14

BTW: I have corrected the second equation. it should not be:
10t+u+u=24

but this:
10t+u+u=74

Answer 15

ok i see

Answer 16

so now we know u=2 we can use the expression we had for t:

t = 9 - u = 9 - 2 = 7

so your two digit number was 72

Answer 17

yes

Answer 18

and you can check this for correctness, the sum of the digits is = 7 + 2 = 9
number plus units digit = 72 + 2 = 74
which matches what the question stated

Answer 19

hope that helps. :)

Answer 20

alright thank you so much!!! :)

Answer 21

yw :)