Question

Write the equation of the line that has an x-intercept of -3 and passes through the point (-3, 7)

Answer 1

x=-3

Answer 2

unless you meant the y-intercept. as of how it is written now, it is a vertical line

Answer 3

how did you find that?

Answer 4

x-intercept means it crosses the point (-3,0)
the other point you have is (-3,7)
which is 2 values for y when x=-3 the slope of the line is undefined(infinity) has to be vertical line.

Answer 5

slope = rise/run = y1-y2 0-(-7) +7
------ = ------- = -------
x1-x2 -3-(-3) 0