To avoid this vicious circle certain concepts must be taken as primitive concepts; terms which are given no definition.

Let's quickly review the steps for writing an equation given two points: Find the slope using the slope formula.

Write the equation using the slope and y-intercept. Ok, now let's apply this skill to solve real world problems. Now you will have to read through the problem and determine which information gives you two points. Remember a point is two numbers that are related in some way.

Also remember, that when identifying a point from a word problem, "time" is always the x-coordinate. In the first year, there were 35 participants. In the third year there were 57 participants.

Write an equation that can be used to predict the amount of participants, y, for any given year, x. Based on your equation, how many participants are predicted for the fifth year? Identify your two points. This can be written as 1,35 In the third year, there were 57 participants.

This can be written as 3, Therefore, our two points are 1,35 and 3,57 Let's enter this information into our chart. Now that we have an equation, we can use this equation to determine how many participants are predicted for the 5th year.

All we need to do is substitute! We will substitute 5 for x x is the year and solve for y.This is called the slope-intercept form because "m" is the slope and "b" gives the y-intercept.

(For a review of how this equation is used for graphing, look at slope and graphing.).

I like slope . Equation of a Line from 2 Points. First, let's see it in action.

Here are two points (you can drag them) and the equation of the line through them. To summarize how to write a linear equation using the slope-interception form you Identify the slope, m. This can be done by calculating the slope between two known points of the line using the slope formula.

Find the equation of the straight line that has slope m = 4 and passes through the point (–1, –6). Okay, they've given me the value of the slope; in this case, m = 4. Also, in giving me a point on the line, they have given me an x-value and a .

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Find the equation of a line passing through the point (4, –7) parallel to the line .

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