|
Question 257343: I can't seem to understand how to write equations of lines. I know its a pretty vague questions but I honestly need your help with it or I might fail the class and my HSA
Answer by dabanfield(803)   (Show Source):
You can put this solution on YOUR website! I can't seem to understand how to write equations of lines. I know its a pretty vague questions but I honestly need your help with it or I might fail the class and my HSA
I'll try to help:
For a point (x,y) to be on a line, x and y must be related in this way:
ax + by + c = 0 where a, b and c are constants. This representation for the equation of the line is called the standard form of a line. Another way to represent the relationship is through what is called the slope-intercept form of a line which is:
y = mx + b. In this alternative repesentation m is the slope of the line and b is the value of y when x = 0 or the value of y when the line the crosses the y axis.
If substituting the values for x and y of a point (x,y) does not make the line equation true then the point is not on the line.
|
|
|
| |
