This is a free lesson from our course in Algebra I
This lesson explains how to determine the equation of a line from a point and
an intercept. It also explains how to find the equation of a line for which both
the xintercept and the yintercept are given.
Generally speaking, if yintercept = c and point (a, b), then the equation
is:
y = [{(b  c)x}/a ] + c. Note that if xintercept = d and yintercept = c, you can still
use the above rule. If you think about the xintercept which is d, it basically
means the line passes through the point (d, 0). Hence, in this case, you have a line
with yintercept = c and passing through point (d, 0). Using the rule from
above, the equation for this line is:
y = [{(0  c)x}/d] + c , i.e.,
y = (cx/d) + c.
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