I think the most useful form of straight-line equations is the "slope-intercept" form: Affiliate This is called the slope-intercept form because "m" is the slope and "b" gives the y- intercept.
But with so many choices, how do we decide which form to use in a real-life situation?
Remember, the point slope form is. NOTE: Also remember, that when identifying a point from a word problem, "time" is always the x-coordinate.
Find the slope using the slope formula. The procedure for solving this problem is very similar to examples 3, 4 and 5. So we just need to set y equal to in our equation, and solve for x.
Substitute the known values into the slope-intercept formula, and then solve for the unknown value of b. That is the basic characteristic of the y-intercept.
Solving for Slope-Intercept Form From Two Points Imagine that you've been asked to write the slope-intercept equation for a line that passes through the points -3, 5 and 2, For a review of how this equation is used for graphing, look at slope and graphing.
Affiliate Common exercises will give you some pieces of information about a line, and you will have to come up with the equation of the line.