Unit 4 review

Write the slope-intercept form of the equation with the given point and slope:

Hint: you have to solve for b.

m = 3 through (1,5)

• y=3x+2

• y=3x-2

• none

• y=3x+5

How would you write the equation:

Slope: 2/3

y-intercept: -3

• y=3/2x+3

• y=2/3-3

• y=2/3x-3

• y=-3x+2/3

Write the equation in point-slope form of the line that passes through the given point and has the given slope.

(4, -7); m = -1/4

• y +7 = -1/4(x - 4)

• y - 4 = -1/4(x + 7)

• y+ 7 = 4(x - 4)

• y - 7 = -1/4(x - 4)

Slopes of parallel lines are...

• opposite reciprocals.
• opposites.
• identical.
• always 7.

Slopes of perpendicular lines are...

• opposite reciprocals.
• opposites.
• identical.
• always 7.

-6x + y = 2
6x + y = 2
These lines are...

• Parallel
• Perpendicular
• Neither

y = -2/3x + 2
y = 3/2x + 9
These lines are...

• Parallel
• Perpendicular
• Neither

What is the slope of a line parallel to the line whose equation is:  -2x + y = - 7?

• -2
• 1/2
• -1/2
• 2

Find the inverse of f(x) = -4x - 12

• f^-1(x) = 4x - 3
• f^-1(x) = -1/4x - 3
• f^-1(x) = 1/4x + 3
• f^-1(x) = -4x - 3

Was the inverse function found correctly?

• no,
• yes