Writing Equations

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2(length + width)

Front

How do you represent 'eight less than 7 times a number' mathematically?

Back

7x - 8

Front

What equation represents the situation: 'John gives the cashier $40 for an MP3 Player that costs $30.98'?

Back

30.98 + c = 40

Front

How can you express the cost of printing posters if the printer charges $250 plus $2 per poster?

Back

Total cost = 250 + 2x, where x is the number of posters.

Front

If Mei has 45 stamps after selling half and buying 19 more, how do you represent her initial number of stamps?

Back

x/2 + 19 = 45

Front

What does 'x' represent in the equation 7x - 8 = 3x + 4?

Back

x represents the unknown number in the equation.

Front

How do you isolate 'w' in the equation w + w + 214 + 214 = 1,409?

Back

Combine like terms to get 2w + 428 = 1,409, then solve for w.

Front

What is the first step to solve the equation 2x + 250 = 1000?

Back

Subtract 250 from both sides to isolate the term with x.

Front

What does the term 'variable' mean in mathematics?

Back

A variable is a symbol (often a letter) that represents an unknown value.

Front

How do you set up an equation for 'the sum of a number and 5 equals 12'?

Back

x + 5 = 12