What is the first step to show that two lines are perpendicular, by looking at the equations of the lines, if they are written in standard form?
a.
find the slope of each line.
b.
graph each equation.
c.
find the y-intercept of each line.
d.
re-write each equation in slope-intercept form.

City l has a temperature of −3 °f. city m has a temperature of −7 °f. use the number line shown to answer the questions: number line from negative 8 to positive 8 in increments of 1 is shown. part a: write an inequality to compare the temperatures of the two cities. (3 points) part b: explain what the inequality means in relation to the positions of these numbers on the number line. (4 points) part c: use the number line to explain which city is warmer. (3 points)