Which of the following equations represents a line that is perpendicular to the line described by the equation 4x + 3y = 12? Choices.
A) 3x + 4y = 11 B) 3x – 4y = 12 C) 5y – 3x = 6 D) 1.5y + 2x = 8 E) 8x – 6y = 2
Perpendicular lines have slopes which are negative reciprocals of each other.   The line 4x + 3y = 12 in slope-intercept form is y = -(4/3)x + 4   The slope of this line is -4/3.   The slope of a perpendicular line is 3/4.   3x - 4y = 12 in slope-intercept form is y = (3/4)x - 3   The answer is 3x – 4y = 12.
<result>B</result>
Which of the following equations represents a line that is perpendicular to the line described by the equation 4x + 3y = 12?