Customers of a satellite dish company must pay for installation of the dish, and a monthly fee with service. After 6 months, Ryan had paid $594. After 11 months, he had paid $989. Write and solve a linear equation to find the cost for installation.

MUST USE
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[tex] \frac{y1 - y2}{x1 - x2}[/tex]

and
y-y1=m(x-x1)​