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There are several ways to write an equation for a line. One common form is ax + by = c, where a, b, and c are some constant values. A very useful form of the line equation is y = mx + b (m and b are constant). Since this is solved for "y", you can easily calculate pairs of value. Besides, m is the slope, and b is the point where the line intercepts the y-axis. This form can't be used to describe a vertical line, though.
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Can you always write the equation of a line if you know one point on the line?
You cannot define a line with a single point (a single point only defines itself). You need two points to define a line (and therefore to write the equation for it).
How do you write an equation with and undefined slope?
Any vertical line has an undefined slope. The equation of the vertical line is x = a where the x-intercept is a.
Write the equation of the line passing through points?
The formula for a line is: Y = mX + b
Write an equation of a line with a negative slope?
y=-2x+3
Why is knowing how to write an equation of a line important?
Because if you ever want to graph that equation you need the actual equation itself to help you graph it.
