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jekas [21]
4 years ago
14

Please Help I don’t understand with 7,8,9 and 10

Mathematics
1 answer:
il63 [147K]4 years ago
5 0

when given two points, you can find the slope of the line that passes through those points by using the slope formula

\frac{y_{2}-y_{1} }{x_{2}-x_{1}}

7. A(1,3), B(4,7)

(x_{1},y_{1}) = (1,3)

(x_{2},y_{2}) = (4,7)

(the ordered pair you choose to use for x1,y1 could be the other ordered pair, it doesn't really matter)

\frac{y_{2}-y_{1} }{x_{2}-x_{1}}

plug in

slope = \frac{(7)-(3)}{(4)-(1)}=\frac{4}{3}

8. C(3,5), D(-2,6)

(x_{1},y_{1}) = (3,5)

(x_{2},y_{2}) = (-2,6)

plug in

slope = \frac{y_{2}-y_{1} }{x_{2}-x_{1}} =\frac{(6)-(5)}{(-2)-(3)}=\frac{1}{-5}=\frac{-1}{5}

9. E(-4,0), F(5,5)

(x_{1},y_{1}) = (-4,0)

(x_{2},y_{2}) = (5,5)

plug in

slope = \frac{y_{1}-y_{1} }{x_{2}-x_{1}} =\frac{(5)-(0)}{(5)-(-4)}=\frac{5}{9}

10. K(-4,4), L(-5,4)

(x_{1},y_{1}) = (-4,4)

(x_{2},y_{2}) = (-5,4)

plug in

slope = \frac{y_{1}-y_{1} }{x_{2}-x_{1}} =\frac{(4)-(4)}{(-5)-(-4)}=\frac{0}{-5+4}=\frac{0}{-1}=0

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