Answer:
x=−5
Step-by-step explanation:
Step 1: Subtract 5x from both sides.
−4x+10−5x=5x+55−5x
−9x+10=55
Step 2: Subtract 10 from both sides.
−9x+10−10=55−10
−9x=45
Step 3: Divide both sides by -9.
−9x
−9
=
45
−9
x=−5
Answer:
x=−5
Given:
John invest $5,000 in one account and $8,000 in an account paying 4% more in interest.
Total interest in one year = $1230
To find:
The rates of the investments.
Solution:
Let x% be the rate of interest on investment $5000.
Then, (x+4)% is the rate of interest on investment $8000.
Total interest is $1230. So,





Divide both sides by 130.


Now,


Therefore, $5,000 is invested at 7% and $8,000 is invested at 11%.
4004 + 50.50t = 300.75t
4004 = 300.75t - 50.50t
4004 = 250.25t
4004 / 250.25 = t
16 = t <=== they charge the same at 16 tons
300.75(16) = 4812 <== they cost the same