Find an equation for the line that passes through (-4, 8) and (3, -7). What is the slope? Where does the line intersect the x-axis and the y-axis?

Question

mathmale · Answer

There is a slope formula that you really do need to learn by heart.  Look up "slope" on the 'Net or in your textbook.

Once you have the slope, use the "slope-intercept form of the equation of a straight line to  complete this problem.   This equation has the form  y=mx+b.

substitute your slope for "m" in this formula.  Now choose one of the two given points.  It has an x-coordinate and a y-coordinate.  Substitute your y-coordinate for y in y=mx+b, and subst. your x-coord. for x in y=mx+b.  Show your work.

When you've reached this point, you'll be able to calculate the y-intercept, b.