7.4 (D) 2. Proportion-Percent-Linear Equation Review

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 78% becomes 0.78.

Front

What is the formula to solve for N in the equation 2N = 10?

Back

N = 10/2.

Front

What does it mean if two quantities are proportional?

Back

It means that as one quantity changes, the other quantity changes at a constant rate.

Front

If John can complete 7.3 Math problems in 8 minutes, how do you set up a proportion to find out how many he can complete in 10 minutes?

Back

Set up the proportion: 7.3 Math/8 Minutes = X Math/10 Minutes.

Front

What is the value of X if 24 = 2X?

Back

X = 12.

Front

How do you cross-multiply to solve a proportion?

Back

Cross-multiply by multiplying the numerator of one ratio by the denominator of the other ratio.

Front

What is the value of N in the equation 3N + 6 = 15?

Back

N = 3.

Front

What is the first step in solving the equation 5X = 25?

Back

Divide both sides by 5 to isolate X.

Front

If 50% of a number is 20, what is the number?

Back

The number is 40.