Normally, one would have a certain pattern and they would make an equation to make the prediction for what values would come next in a sequence ( or at some x value ), but if one had an equation such as y=3x+4 ( I am using examples because this was a very general question ) they could see that when x is 0 y=4 and that the y value increases three units for every change in x value. since y=4 when x=0, 4 may be called the initial value as well as the y-intercept ( in fact this is generally true for all mathematical models ). This is where the pattern starts.
To use equations for predictions from patterns, first identify the number pattern and create an equation. Then, by substituting values into the equation, predictions can be made based on that pattern. For example, an equation could predict future numbers in a sequence consistently, like predicting the next number in a series of increasing values.
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