There are several ways to write an equation for a line. One common form is y = ax + b, where a is the slope and b is the y-intercept (where the line intercepts the y-axis).
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The equation is the definition of the line.If the line is undefined, then it has no equation.
If it is a straight line, then the equation is linear.
General form for a line equation is: y=mx+b.
Substitute the coordinates of the point into the equation of the line. If the equation is still valid then the point is on the line; if not then it is not.
2y= 3x+6