Answer:
[tex]m = 0.5714[/tex]
Step-by-step explanation:
Slope Intercept Form:
y = 0.5714x + -6
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[tex]m=\frac{(y_{2}-y_{1} ) }{(x_{2}- x_{1} )}[/tex]
[tex]m=\frac{(-18--6)}{(-21-0)}[/tex]
[tex]m=\frac{(-18--6)}{(-21-0)} =\frac{-12}{-21}[/tex]
[tex]m=0.5714[/tex]