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The idea of using known information to reach the right result also applies well to basic algebra, especially when a problem gives you a specific point and a rate of change. The point slope form y − y₁ = m(x − x₁) uses exactly those two pieces of information, so https://slopecalculators.com/point-slope-form/ can be useful when checking how the values fit into the formula. It also helps clarify how to find the slope from two points and how the same line can be rewritten in different forms.