X-intercept = twice y-intercept, fractional coord of point: Find the general equation of the line with x-intercept equal to twice the y_intercept and through the point (3/2, 1/2).
Let the unknown y-intercept be denoted by i, and the unknown x-intercept by 2i. We can use the definition of the 2 Intercept Rule:
.
Next we can substitute the coordinates of the point required to be on the line and solve for i:
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We can multiply both sides by 2i to get
, or
. Now we can substitute this back into the 2 intercept form:
. We can multiply by 2*(5/4) and get
, or in the general form,
.