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One can graph a line if we know only its slope and one point on it. First, plot the point. Next, if the slope is a fraction, move to the right the number of spaces equal to the denominator, and move up (or down, if the slope is negative) the number of spaces equal to the numerator. Plot a point at the spot you end up. If the slope is not a fraction, move 1 space to the right and then move up or down the number of spaces equal to the slope. You can also move left the number of spaces in the denominator and down (or up if negative) the number of spaces in the numerator and plot a point at the spot you end up.
Connecting these points with a straight line and extending on both sides yields a line with the desired slope and containing the given point.
Example 1. Graph the line which passes through (2, 3) and has a slope of .
Example 2. Graph the line which passes through (1, 1) and has a slope of -4.
We can find the slope of any line represented by an equation. Here are the steps:
Example 3. Find the slope of the line given by the equation 5y = - 2x + 1
Example 4. Find the slope of the line given by the equation 2y - x + 15 = 0
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