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yan [13]
3 years ago
10

Write the equation of the line that passes through the points (-9, -7) and (-4, 4).

Mathematics
1 answer:
Amanda [17]3 years ago
6 0

Answer:

y-4 = \frac{11}{5} (x+4)    

Step-by-step explanation:

1) First, find the slope of the line. Use the slope formula m = \frac{y_2-y_1}{x_2-x_1} to find the slope. Substitute the x and y values of the given points into the formula and solve:  

m = \frac{(4)-(-7)}{(-4)-(-9)} \\m = \frac{4+7}{-4+9} \\m = \frac{11}{5} \\

Thus, the slope is \frac{11}{5}.

2) Now, use the point-slope formula, or y-y_1 = m (x-x_1) to write the equation of the line in point-slope form. Substitute values for m, x_1, and y_1.

Since m represents the slope, substitute \frac{11}{5} for it. Since x_1 and y_1 represent the x and y values of one point on the line, choose any one of the given points (either one is fine, the equation will represent the same line) and substitute its x and y values into the formula as well. (I chose (-4, 4) as seen below.) Make sure to simplify the double negatives to positives. This gives the following answer in point-slope form:  

y-(4) = \frac{11}{5} (x-(-4))\\y-4 = \frac{11}{5} (x+4)

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