Solving Systems Using Substitution PreAlgebra I can find solutions to systems of linear equations in two variables.

Using substitution…. Solution is (2, 4) Check!

Substitution Graphic Method (3.75, 2.75)

Solve using substitution. Check!

Solve using substitution. Check!

Solve using substitution. Check!

Reflection… Give an absent student a set of directions for solving a system of equation using the substitution method. Remember to be specific because he/she isn’t in class today!

Extended Writing…. Explain the difference between solving a system of equations using graphing and substitution. Which method do you prefer and why? Be specific and justify your answer.

Kuta worksheet Solving Systems Of Equations by Substitution #1-10

Chatty Phone charges a flat monthly fee of $20 plus 8 c a minute. Telco charges $14 plus 10 c a minute. When do they charge the same? Let x = # of minutesLet y = total cost ChattyTelco At 300 min. they charge the same.

An office supply company sells two types of fax machines. They charge $150 for one the the machines and $225 for the other. If the company sold 22 fax machines for a total of $3900 last month, how many of each type were sold? Let x = 150 fax machineLet y = 225 fax machine They sold 14 of the $150 machines and 8 of the $225 machines

You are trying to decide which movie rental store to use. Video Mart charges a $10 annual membership fee, and movie rentals are $3 each. Media Mart charges a $25 annual membership fee, but only charges $2.50 per movie rental. Which store would be cheapest to use? Video MartMedia Mart Renting 30 movies they charge the same. Let x = # of moviesLet y = total cost

There are 22 coins in a jar, all nickels and quarters. The total value of the coins is $4.50. How many of each type coin are there? Let x = # of nickelsLet y = quarters There are 17 quarters and 5 nickels.