SOLUTION: What is n for this formula please. (4n-6)x1/2=5 and (5n-3)x2/4-1=5, it says to backtrack to solve n, help would be much appreciated. Thankyou Maria
Question 872597: What is n for this formula please. (4n-6)x1/2=5 and (5n-3)x2/4-1=5, it says to backtrack to solve n, help would be much appreciated. Thankyou Maria Answer by Edwin McCravy(20060) (Show Source):
(4n-6)×=5
Let's go forward first with n and then we'll know how to backtrack
Start by pretending that you know what number the letter n represents.
1. Start with n
2. Multiply n by 4 ---> you get 4n
3. Subtract 6 ---> Now you have (4n-6)
4. Multiply by ---> Now you have (4n-6)× and you
have finished and you knoe that the answer
you got here would have equaled to 5
Now let's backtrack:
Start with 5, for that's what the answer was.
We take 5 and do the opposite of what we did in step 4.
Step 4 was to multiply by
The opposite of multiply is divide,
So we divide 5 by
5÷ = ÷ = × = = 10
So backtracking on step 4 gives us 10
We take 10 and do the opposite of what we did in step 3.
Step 3 was to subtract 6
The opposite of subtract is add,
So we add 6 to 10
10+6 = 16
So backtracking on step 3 gives us 16
We take 16 and do the opposite of what we did in step 2.
Step 2 was to multiply by 4
The opposite of multiply is divide.
So we divide 16 by 4
16÷4 = 4
So backtracking on step 4 gives us 4
Since step 1 was "Start with n", we have ended with n
Therefore the letter n equals 4, or n=4.
That is the solution n=4
-------------
Let's check n=4 to make sure it is correct:
(4n-6)× =5 <--- put ×4 for n
(4×4-6)× =5 <--- multiply 4 by 4, get 16
(16-6)× =5 <--- subtract 16-6, get 10
(10)× =5 <--- multiply 10 by , get 5
5 = 5 <--- both sides of the = have the same number 5
So n=4 is the correct solution.
See if you can backtrack on the other one the same way.
If you have trouble, just tell me in the thank-you note and I'll
get back to you.
Edwin