Q. 174.0( 4 Votes )

The perpendicular from the origin to the line y = mx + c meets it at the point (-1, 2). Find the values of m and c.

Answer :

Given: perpendicular from the origin and meets at the point (-1, 2)


Explanation:


The given line is y = mx + c which can be written as mx –y + c = 0 … (1)


The slope of the line perpendicular to y = mx + c is


So, the equation of the line with slope and passing through the origin is



x + my = 0 … (2)


Solving eq(1) and eq(2) by cross multiplication, we get




Thus, the point of intersection of the perpendicular from the origin to the line y = mx + c is


It is given that the perpendicular from the origin to the line y = mx + c meets it at the point (-1, 2)


and


m2 + 1 = mc and m2 + 1


mc


m


Now, substituting the value of m in m2 + 1 = mc, we get



c


Hence, m and c


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