Standard form of line equation where m is slope and c is y-intercept. Most intuitive form for graphing.
Linear regression — Best fit line for data: y = mx + c.
Economics — Cost function: Total Cost = (Variable Cost per unit × Quantity) + Fixed Cost.
Physics — Celsius to Fahrenheit: F = 1.8C + 32.
Phone bills — Monthly charge = (rate per minute × minutes) + base fee.
Taxi fares — Fare = (rate per km × distance) + base fare.
Currency conversion — INR = (exchange rate × USD) + fee.
Medicine — Drug concentration over time (linear phase).
Depreciation — Linear depreciation: Value = -d×year + initial.
Cooking — Temperature: T = rate×time + initial.
Sports — Scoring rate: Score = points/minute × time + initial.
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