Simple EXPRESSIONS/EQUATIONS

Henry is buying three burgers for his kids. The big burger is twice the cost of each of the other small burgers. If a is the cost of the big burger, which of the following is the equation for T, the total amount Henry paid for burgers.

• T = a + 3a

• T = a + 2a

• T = 3a

• T= a + a/2 + a/2

3x - 7y +z = 90

How many variables does this equation have?

• 4

• 1

• 2

• 3

3x - 7y +z = 90

Find the coefficients

• 3, 7, 1, 90

• 3, -7, 1, 90

• 3, -7, 1

• 3,7,1

3x - 7y +z = 90

Find the constant in this equation

• -90

• 3

• 1

• 90

Identify the expression(s)

• 3x-y+4

• 3x-y+4 = a

• 7+2y = 9

• 7-2y+9

Identify the equations

• 7-2y+8 = 0

• 18+2y+a

• a+2b+c = 0

• 7-2y+4+8

3x + 5 +7y = 5x -2

What are your thoughts about the above statement.

Dont worry: There is no right/wrong answer...this is to see your understanding

• This is an equation

• We have two expressions in this equation

• The two expressions in this equation are

  3x+5+7y and 5x-2

• The two expressions are related by an EQUALS sign..which means the two expressions are equal(they balance each other)

t = 3b + 2p

This is an equation to represent 't' the total cost of 3 books and 2 pens. Can you draw a picture to show this scenario.

PS: Feel free...I dont judge you on your drawings :)

Janet has three times as much money as the amount he had one month ago. The total money he has now is 40 dollars. If 'a' is the amount of money he had one month ago, which of the following is an equation to represent this scenario.

• a - 3a = 40

• a + 3a = 40

• 3a +a = 40

• 40 + 3a= a

For a bill totaling $5, a cashier received 25 coins consisting of nickels and quarters.

If 'n' is the number of nickels he received and

'q' is the number of quarters he received,

write an equation to represent this scenario

• 25 = n + q

• n +q = 25

• q + n = 25

• n +5 = q