Bluebook SAT Test Linear Functions 4

Question 1

The linear function h models the height (in feet) of a balloon t minutes after launch: h(t) = 120 + 15t. What is the height of the balloon after 8 minutes?

Accepted Answer

240 feet

Answer

135 feet

Answer

180 feet

Answer

195 feet

Question 2

What is the x-intercept of the line with equation 3x + 5y = 15?

Accepted Answer

(5, 0)

Answer

(3, 0)

Answer

(0, 3)

Answer

(15, 0)

Question 3

Two linear functions are defined as f(x) = 2x + 3 and g(x) = 2x − 5. Which of the following is true about their graphs?

Accepted Answer

They are parallel (never intersect)

Answer

They intersect at one point

Answer

They are the same line

Answer

They are perpendicular

Question 4

A student earns $12.50 per hour working part-time. If the student works h hours and has already saved $75, which function gives the total savings S(h)?

Accepted Answer

S(h) = 12.50h + 75

Answer

S(h) = 75h + 12.50

Answer

S(h) = 12.50h − 75

Answer

S(h) = 12.50 + 75h

Question 5

Line m has the equation x = −4. Which of the following best describes this line?

Accepted Answer

A vertical line at x = −4

Answer

A line with slope −4

Answer

A horizontal line at y = −4

Answer

A line with y-intercept −4

Question 6

If g(x) = mx + 4 and g(5) = 19, what is the value of m?

Accepted Answer

3

Answer

2

Answer

4

Answer

5

Question 7

The table shows a linear relationship between x and y.

x:  −2   0   2   4
y:   1   5   9  13

Which equation represents this relationship?

Accepted Answer

y = 2x + 5

Answer

y = 4x + 5

Answer

y = 3x + 5

Answer

y = 2x + 1