CPM Homework Help : CAAC Problem 8-121

Multiple Choice: Which line below is perpendicular to the line 2x − 5y = 3? Homework Help ✎
1. 2x + 5y = 7
2. −2x + 5y = 4
3. 5x − 2y = −1
4. 5x + 2y = 3

Hint:

Two lines are perpendicular if their slopes are negative reciprocals.

Put each equation, including the one in the problem, into slope intercept form.

Hint:

Solve for y.

2x − 5y = 3

−5y = −2x = 3

$y=\frac{2}{5}x+\frac{3}{5}$

Answer:

$m=\frac{2}{5}$

Reminder:

$\text{For a perpendicular line, }m=-\frac{5}{2}.$

Hint (a):

Solve for y.

Hint (b):

Solve for y.

Hint (c):

Solve for y.

Hint (d):

Solve for y.

Answer (d):

Correct!