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AnnyKZ [126]
3 years ago
11

In the standard (x, y) coordinate plane, what is the slope of the line joining the points (3,7) and (4,−8)?

Mathematics
1 answer:
umka2103 [35]3 years ago
4 0
(3,7) \ and  \ (4,-8)\\ \\ First \  find \ the \  slope \ of \ the \ line \ thru \  the \  points \: \\ \\ m= \frac{y_{2}-y_{1}}{x_{2}-x_{1} }  \\ \\m=\frac{-8-7}{4-3} =  \frac{-15}{1}=-15 \\ \\Now \  use \ y = mx + b \ with  \ either \  point \  to  \ find  \ b,  \ the \  y-intercept \ : \\ \\ y=mx+b \\ \\7=-15*3+b\\ \\7=-45 +b \\ \\b=7+45\\ \\b=52 \\ \\  y= - 5x+52 \ is \  the \  answer

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