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The general equation of a straight line is y = mx + c.

m is the gradient of the line, and c is the y-intercept. Two lines are perpendicular to each other if their gradients are the negative reciprocals of each other. This means that, if one line has gradient 2, all lines which are perpendicular to it (in 2D) will have a gradient of -1/2.

A line passes through the origin if it has a y-intercept of 0 - this is c. So, the two lines must have a non-zero value of c as well as having the correct gradients as described above.

For example, two lines which meet the prescribed conditions are:

y = 2x - 3 and y = (-1/2)x + 674

Another two such lines are:

y = x + 5 and y = 3 - x

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14y ago
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12y ago

That same description could apply accurately to an

infinite number of pairs of perpendicular lines.

One line would have a positive slope in which one point on the line would be (0,y) and (-x,0), and the other line would have a negative slope in which one point on the line would be (0,y) and (x,0), in which the point (0,y) is the same for both lines, and in which the values for x in the points (x,0) and (-x,0) are the additive inverses of each other.

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Q: What two perpendicular lines have the same y-intercept and do not pass through the origin?
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