y 25x y 15x +50 y 10x + 100 250 200 Platinum 150 Standard 100 10 Monthly 15 50 Monthly is cheapest Platinum is cheapest 25 + + 2 3 4 9. 10 11 12 Month Total cost ($)
Equations and Inequations
Equations and inequalities describe the relationship between two mathematical expressions.
Linear Functions
A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.
The figure below shows total costs for three gym memberships. Which is the most accurate statement?
***SEE CHART***
Of the 3 memberships, Monthly is cheapest for under 5 months, while Standard is cheapest for over 10 months.
Platinum is costliest for any duration
Monthly is cheapest for any duration except for 5-10 months
Standard is cheapest for a duration between 5-10 months; other plans are cheaper for shorter or longer durations.
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