7.4 Equations in Two Variables

Tell whether the ordered pair is a solution.

 $y=7x;\ \left(2,\ 21\right)$  

• no

• yes

Tags

CCSS.HSA.REI.D.10

CCSS.HSA.REI.D.11

CCSS.HSF.IF.A.1

CCSS.HSF.IF.A.2

Tell whether the ordered pair is a solution.

 $y=5x+1;\ \left(3,\ 16\right)$  

• no

• yes

Tags

CCSS.HSA.REI.D.10

The equations y=128-8x gives the amount y (in fluid ounces) of milk remaining in a gallon jug after you pour x cups. Identify the independent and dependent variables.

• Because the amount y remaining depends on the number x of cups you pour, y is the dependent variable and x is the independent variable

• Because of the amount you pour x depends on the amount y that you have remaining, x is dependent and y is the independent

The equation y=10x+25 gives the amount y (in dollars) in your savings account after x weeks. Identify the independent and dependent variables.

• x (weeks) is dependent, y (in dollars) is independent

• x (weeks) is independent, y (in dollars) is dependent

The equation y=10x+25 gives the amount y (in dollars) in your savings account after x weeks. How much is in your savings account after 3 weeks?

The equation y=10x+25 gives the amount y (in dollars) in your savings account after x weeks. How much is in your savings account after 10 weeks?

The equation A=22w gives the area A (in square feet) of a rectangular garden with a width of w feet. Identify the independent and dependent variables.

• A (area) is independent, w (width) is dependent

• A (area) is dependent, w (width) is independent

The equation c=0.15s gives the amount c (in dollars) of commission a car salesperson receives for making a sale of s amount of dollars.

• c (in dollars) is independent, s (sale amount) is dependent

• c (in dollars) is dependent, s (sale amount) is independent

The equation t=15p+15 gives the total cost t (in dollars) of a meal with a tip of p percent (in decimal form).

• t (in dollars) is independent, p (percent) is dependent

• t (in dollars) is dependent, p (percent) is independent

What is the constant being multiplied each time in the table?

• times 5

• times 3

• times 4

• times 2