## Practice questions

- What is the slope of the line given by the equation 3
*x*= 30 – 5*y*? - In the standard
*xy*-coordinate plane, what is the slope of the line that is perpendicular to the line 5*y*– 12*x*= 35?

## Answers and explanations

- The correct answer is Choice
**(D).**Order the equation in slope-intercept form:

*y*=*mx*+*b*. The*m*value will be the slope. - The correct answer is Choice
**(A).**To find the slope of the given line, put it in the slope-intercept form:

So the slope of the given line is 12/5.To determine the slope of a perpendicular line, flip the fraction and change the sign. The slope has to be negative, so eliminate Choices (C), (D), and (E). Flip the numerator and denominator to get