## Algebra 2 Tutorial

*Verbal Problems Solving for two unknowns with two equations*

#### Intro

This Tutorial I wrote presents six problems with increasing difficulty that use Substitution and Elimination methods to obtain both unknowns. I will break it up into two parts.

#### Sample Problem

Problem 1) In a certain year, a movie and its sequel grossed a combined total of $ 1536 million. If the sequel grossed $ 112 million more than the movie, find how much each movie grossed.

Problem 2) The price of a small popcorn is $ 4 and it is $ 6 for the large size. The total number of popcorns sold is 78 and the total sales revenue was $ 420. Find the number of small and large popcorns.

Problem 3) If you invest three times as much in a 5% interest account than you did in a 4% interest account, how much was invested in each account if the total interest paid was $ 475?

#### Solution

Problem 1) X= movie income; Y = sequel income

X + Y = 1536 and Y = X + 112

Use Substitution. X + (X + 112) = 1536 so 2X = 1536-112= 1424

**The movie grossed 712 million and the sequel grossed 824 (712+112) million**

Problem 2) Let X=Number of small popcorns and Let Y=Number of large popcorns

X + Y = 78 and 4X + 6Y = 420

Use Substitution. X = 78 – Y and substitute into the second equation.

4 (78-Y) + 6Y = 420 so 312 – 4Y + 6Y = 420 so 312 + 2Y = 420 so 2Y = 108

**Y = Number of large popcorns = 54 and X = Number of small popcorns = 78-54 = 24**

Check: $4(24) + $6(54) = 96+324= $ 420

Problem 3) Let X= amount invested in 4% account and Y = amount invested in 5% account

Y = 3X and 0.04X + 0.05Y = 475 Use Substitution.

0.04X + 0.05 (3X) = 475 0.19X = 475

**X = 475/0.19 = $ 2500 and Y = 3 (2500) = $ 7500**

Check: 4% of 2500 + 5% of 7500 = 100 + 375 = $ 475

# About The Author

Experienced Math Science Test Prep Instructor |

I have been a Math and Science Teacher and Tutor for over fifteen years and hold Math Teacher Certifications from Florida, New Jersey, and New York. I have also taught Math SAT/ACT Classes. I have a Math Masters and Chemistry Bachelor's degree. Currently, I am a Math Adjunct Professor and Tutor at C... |