Linear Function Review

Which of the following equations represents a linear function?

• y = 2x - 3

• y=2x+2

• y=x+5

• y = x^2 + 2

• y = sqrt{x} + 5

What is the slope of the line y=3x−7?

• 3

• -7

• -3

• 7

In the equation y=−2x+4, what is the y-intercept?

• -2

• 4

• -4

• 2

Which of these graphs represents a linear function?

• A parabola

• A straight line

• A circle

• A hyperbola

Which of these is the slope-intercept form of a linear equation?

• ax^2 + bx + c = 0

• y = mx + b

• x^2 + y^2 = r^2

• a + b = c

What is the slope of the line passing through points (2, 4) and (6, 8)?

• 12\frac{1}{2}

• 2

• 43\frac{4}{3}

• 1

What is the slope of a horizontal line?

• Undefined

• Zero

• Positive

• Negative

What is the slope of a vertical line?

• Zero

• Undefined

• Positive

• Negative

Two lines are parallel if their slopes are:

• Reciprocal

• Negative

• Equal

• Opposite

Two lines are perpendicular if their slopes are:

• Reciprocal and opposite in sign

• Equal

• Undefined

• Identical