A linear equation may be used to convert a unit price to a price for the quantity that you want. For example, if one bottle of drink costs C units then (at that same price) 5 bottles will cost 5*C units. It is used in the same way by businesses.
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You can graph a linear equation slope intercept by solving the equation and plugging in the numbers : y=mx+b
i dont know 8x+5y=89
A linear equation looks like a straight line, it sometimes does slope, but it is straight.
Yes, the equation has a slope of 0.
Slope= rise over run