Writing Equations with Variables on Both Sides

Write an equation to represent the situation.

Garrett can order stickers from two companies. Company A charges a $30 design fee plus $0.80 per sticker. Company B charges a $14 design fee plus $1.20 per sticker. How many stickers would Garrett have to order for the cost at both companies to be the same?

Tip: use "x" as the variable.

Mathematical Equivalence

ON

Write an equation to represent the situation.

Garrett can order stickers from two companies. Company A charges a $30 design fee plus $0.80 per sticker. Company B charges a $14 design fee plus $1.20 per sticker.

Use the equation to answer the question:

How many stickers would Garrett have to order for the cost at both companies to be the same?

Mathematical Equivalence

ON

Write an equation to represent the situation and solve the equation

Maria is monitoring the temperature of two substances in her science lab. Substance A is currently 96.2° and rising 1.5° each minute. Substance B is currently 98.5° and cooling 0.8° each minute.

Tip: use x as the variable

Mathematical Equivalence

ON

Write an equation to represent the situation and solve the equation

Maria is monitoring the temperature of two substances in her science lab. Substance A is currently 96.2° and rising 1.5° each minute. Substance B is currently 98.5° and cooling 0.8° each minute.

Answer the question:

After how many minutes will the two substances be at the same temperature?

Mathematical Equivalence

ON

Write an equation to represent the situation

Jaycie has a VIP membership to a movie theater which costs $27 a year and $6.00 for each movie she sees. Claire doesn't have a membership, so she pays $8.25 for each movie she sees.

Tip: use x as the variable

Mathematical Equivalence

ON

Write an equation to represent the situation and solve the equation

Jaycie has a VIP membership to a movie theater which costs $27 a year and $6.00 for each movie she sees. Claire doesn't have a membership, so she pays $8.25 for each movie she sees.

Answer the question:

How many movies would the two girls have to see in a year in order to pay the same amount?

Mathematical Equivalence

ON

Write an equation to represent the situation

Gayle started with 30 pairs of shoes and donated x pairs. Her sister Bonnie started with 22 pairs of shoes and donated half as many pairs as Gayle did.

Tip: use x as the variable

Mathematical Equivalence

ON

Write an equation to represent the situation

Gayle started with 30 pairs of shoes and donated x pairs. Her sister Bonnie started with 22 pairs of shoes and donated half as many pairs as Gayle did.

Answer the question:

How many pairs of shoes did Gayle donate if they had the same number of shoes remaining?

Mathematical Equivalence

OFF

Write the equation:

Two more than a certain number is 15 less than the product of ⅞ and the number.

Tip: use x as the variable

Next question: solve for x...

Mathematical Equivalence

ON

Solve the equation from the previous question:

Write the equation:

Two more than a certain number is 15 less than the product of ⅞ and the number.

Mathematical Equivalence

OFF