Question

select the correct answer.which equation represents the horizontal line passing through (9,-7)?x = 9y = 9x = -7y = -7

Answer 1

In order to answer this question, first, remember that the equation of a line is:

$y=mx+b$

With m being the slope, and b being the y-intercept. Since in this case, the slope is 0 because it is a horizontal line, we have that:

$y=b$

And we are given that it passes through a point in which the y-coordinate is -7, therefore:

$y=\text{ -}7$

Therefore, the correct answer is y = -7, the fourth option.