y+ 4= -2( x-2 )
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A line is represented by an equation. Each solution of the equation is a point on the line, and each point on the line is a solution to the equation. So the line is just the graph of the solution set of the equation.
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3x + 2y = 8 This is an equation. It could be the equation of a line.
By finding the line of best fit and using the straight line equation formula.
There is no equation there but the slope of the line is the number that multiplies x in the straight line equation y = mx + b whereas m is the slope and b is the y intercept