In an equation, the consistent value is called the rate of change or slope, and it is a known value.
Linear equations can solve practical matters in life, such as:
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- The equation for a cellphone bill with a flat rate of $25 per month plus 25 cents per message would be y = 25 + 0.25x, with x as the number of messages and y as the monthly cost.
- The equation for taxi cab fares based on a set fee of $2 per mile would be y = 2x, with x as the amount of electricity used and y as the amount of the bill.