Question 160431
Remember, equations of the form {{{x=k}}} are ALWAYS perpendicular to equations of the form {{{y=n}}}. Since the y-coordinate is 17, this means that the equation {{{y=17}}} is the perpendicular line to {{{x=4}}} that goes through (1,17)



Note: the equation in slope intercept form is {{{y=0x+17}}} where the slope is {{{m=0}}} and the y-intercept is {{{b=17}}} which is the point (0,17)