Quiz about 7.4 Equations in Two Variables

Question 1

Tell whether the ordered pair is a solution.

y=7x;\ \left(2,\ 21\right)

Accepted Answer

no

Answer

yes

Question 2

Tell whether the ordered pair is a solution.

y=5x+1;\ \left(3,\ 16\right)

Accepted Answer

yes

Answer

no

Question 3

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.

Accepted Answer

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

Answer

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

Question 4

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

Accepted Answer

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

Answer

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

Question 5

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.

Accepted Answer

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

Answer

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

Question 6

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.

Accepted Answer

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

Answer

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

Question 7

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

Accepted Answer

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

Answer

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

Question 8

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

Accepted Answer

times 3

Answer

times 5

Answer

times 4

Answer

times 2

Question 9

Write an equation for the table.

Accepted Answer

y=3x

Answer

y=5x

Answer

y=4x

Answer

y=2x

Question 10

What is the constant be multiplied each time in the table? (hint: if it was being divided by 2 then you could use the reciprocal of that number and say it is being multiplied by 1/2)

Accepted Answer

1/4

Answer

2

Answer

1/8

Answer

8

Question 11

Write an equation for the table based on the constant.

Accepted Answer

y=1/4x

Answer

y=4x

Answer

y=1/8x

Answer

y=1/2x

Question 12

Tell whether the ordered pair is a solution.

y=5x+1;\ \left(3,\ 16\right)

Accepted Answer

yes

Answer

no

Question 13

What is the constant being multiplied by t each time in the graph?

Accepted Answer

times 90

Answer

times 60

Answer

times 70

Answer

times 80

Question 14

What is the equation for the graph?

Accepted Answer

d=90t

Answer

d=60t

Answer

d=70t

Answer

d=80t

Question 15

The graph represents the cost c (in dollars) of buying n tickets to a baseball game. How much does it cost for ONE ticket? (that is the constant that you will multiply by to write an equation)

Accepted Answer

$10

Answer

$15

Answer

$20

Answer

$25

Question 16

The graph represents the cost c (in dollars) of buying n tickets to a baseball game. Write an equation in 2 variables that represents the graph.

Accepted Answer

c=10n

Answer

c=15n

Answer

c=20n

Answer

c=25n

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