7.4 - 7.7 Practice For use after Lessons

Tell whether the ordered pair is a solution of the equation. Is (0, 2) a solution to y = 2x?

• True

• False

Tell whether the ordered pair is a solution of the equation. Is (2, 12) a solution to y = 6x?

• True

• False

Tell whether the ordered pair is a solution of the equation. 3. y = 2x + 3; (3, 9) Is (3, 9) a solution to y = 2x + 3?

• True

• False

Tell whether the ordered pair is a solution of the equation. 4. y = x + 4; (1, 3) Is (1, 3) a solution to y = x + 4?

• True

• False

Identify the independent and dependent variables. The equation p = 8.65h gives the amount p (in dollars) of pay a clerk receives for working h hours. What is the independent variable? What is the dependent variable?

• Independent variable: h (hours); Dependent variable: p (pay in dollars)

• Independent variable: p (pay in dollars); Dependent variable: h (hours)

• Independent variable: 8.65; Dependent variable: h (hours)

• Independent variable: 8.65; Dependent variable: p (pay in dollars)

Identify the independent and dependent variables. The equation P = 4s gives the perimeter P (in inches) of a square mouse pad with a side length of s inches. What is the independent variable? What is the dependent variable?

Identify the independent and dependent variables. The equation c = 42t + 42 gives the total cost c (in dollars) of a grocery bill with a sales tax of t percent (in decimal form). What is the independent variable? What is the dependent variable?

• Independent variable: t (sales tax in decimal form); Dependent variable: c (total cost in dollars)

• Independent variable: c (total cost in dollars); Dependent variable: t (sales tax in decimal form)

• Independent variable: 42; Dependent variable: t (sales tax in decimal form)

• Independent variable: 42; Dependent variable: c (total cost in dollars)

Avocados cost $3 per pound. Which equation in two variables represents the cost of buying avocados?

• C = 3p

• C = p + 3

• C = 3 + p

• C = p/3

Write the word sentence as an inequality. 1. A number n is at least 4.

Write the word sentence as an inequality. 2. A number x is less than 12.

• x < 12

• x > 12

• x = 12

• x ≥ 12