AGS Chapter 2 Test Review

What is the domain of the following points?

(1,5), (3,7), (5,9), (7,11)

• 1, 3, 5, 7

• 5, 7, 9, 11

• 1, 5, 5, 9

• 3, 7, 7, 11

Answer explanation

Domain is all the x values of a set of points.

What is the range of the following points?

(1,2), (2,1), (3,0), (4,-1)

• 1, 2, 3, 4

• 2, 1, 0, -1

• 1, 2, 3, 0

• 2, 1, 4, -1

Answer explanation

Range is all the y values of a set of points.

Choose the correct function for "Choose any number; multiply it by 3, then add 9."

• f(x)=3x-9

• f(x)=3x+9

• f(x)=-3x+9

• f(x)=-3x-9

Choose the correct function for "Choose any number; divide it by -4, then subtract 6."

• f(x)=-1/4x+6

• f(x)=4x-6

• f(x)=-1/4x-6

• f(x)=-4x+6

Answer explanation

Remember, multiplying by the reciprocal is the same as dividing. The reciprocal is the fraction flipped upside down. If a number doesn't have a denominator (bottom number), that number is automatically 1.

What are the zeroes of f(x)=4x+8?

• x=4

• x=2

• x=-8

• x=-2

Answer explanation

To find the zeroes, set the equation = to zero and list all answers for x that make it true (solve for x).

• x= -10

• x= 10 or -10

• x=10

• x=100

Answer explanation

If you are taking the square root of a number, the answer can be positive or negative. 10x10=100 -10x-10=100

What is the y-intercept of f(x)=2x-6?

• 2

• -2

• 6

• -6

Answer explanation

The b in the form y=mx+b is the y-intercept. Remember that f(x) is the same as y.

What is the y-intercept of f(x)=1/3x?

• 1/3

• -1/3

• 0

• 3

Answer explanation

If there is no b in y=mx+b format, then the y-intercept is zero.

What is the slope of the line f(x)=-1/4x+3

• 1/4

• -1/4

• 3

• -3

Answer explanation

Slope is the m in the form y=mx+b. Remember f(x) is the same as y.

What is the slope of y=x?

• 1

• -1

• 0

• -0

Answer explanation

Remember, if there is no m in the form y=mx+b, the slope is just 1.