|
Question 213997: The sum of two numbers is 84. The first is 9 more than 4 times the second. Find the first number.
Answer by drj(1380)   (Show Source):
You can put this solution on YOUR website! The sum of two numbers is 84. The first is 9 more than 4 times the second. Find the first number.
Step 1. Let x be the second number. Let 9+4x is be first number.
Step 2. x+9+4x=84 The sum of two numbers is 84.
Step 3. Simplify: 5x+9=84.
Step 4. Subtract 9 to both sides of equation: 5x+9-9=84-9=75
Step 5. Simplify and divide by 5: 5x=75 or x=15. Then 9+4x=9+4(15)=69
Step 6. The first number is 69.
I hope the above steps were helpful.
For free Step-By-Step Videos on Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra or for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.
And good luck in your studies!
Respectfully,
Dr J
|
|
|
| |
