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Snowcat [4.5K]
3 years ago
7

Slope-intercept form of the equation for the line?

Mathematics
1 answer:
vaieri [72.5K]3 years ago
4 0

Answer:

\large\boxed{y=-\dfrac{3}{10}x+\dfrac{1}{2}}

Step-by-step explanation:

The slope-intercept form of an equation of a line:

y=mx+b

m - slope

b - y-intercept

The formula of a slope:

m=\dfrac{y_2-y_1}{x_2-x_1}

We have the points from the graph (-5, 2) and (5, -1).

Substitute:

m=\dfrac{-1-2}{5-(-5)}=\dfrac{-3}{10}=-\dfrac{3}{10}

We have the equation in form:

y=-\dfrac{3}{10}x+b

Put the coordinates of the point (5, -1) to the equation:

-1=-\dfrac{3}{10}(5)+b

-1=-\dfrac{3}{2}+b

-\dfrac{2}{2}=-\dfrac{3}{2}+b            <em>add 3/2 to both sides</em>

\dfrac{1}{2}=b\to b=\dfrac{1}{2}

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