MPM2DI ­ U1 ­ 10 ­ Word Problems 1.notebook
February 18, 2016
Warm up
Solve by elimination
4x + 3y = 13
5x - 4y = -7
Method 1: Eliminate x
4x + 3y = 13
5x - 4y = -7
Method 2: Eliminate y
4x + 3y = 13
5x - 4y = -7
Solving Problems Using Linear Systems
Day 1
Linear systems can be used to solve problems involving two variables (actually, any number of variables, but we are just using two for now). You can solve by graphing, using substitution or using elimination.
MPM2DI ­ U1 ­ 10 ­ Word Problems 1.notebook
February 18, 2016
Examples
1) Christian has a total of eight cars and trucks to play with. His birthday is soon. He hopes to double the number of cars he has now. If he does, he will have a total of 11 cars and trucks. How many cars does he have now? How many trucks?
2) Billy invests $5000. He invests part of the money at 4%/year, and the rest at 3.5%/year. After 1 year, these investments earn $180 in simple interest. How much did he invest at each rate?
MPM2DI ­ U1 ­ 10 ­ Word Problems 1.notebook
Quiz Time!
Entertainment p. 44 # 4, 5, 8
Challenge #9
February 18, 2016