Question

The equation of the straight line which is perpendicular to y=x
and passes through (3, 2) is [MP PET 2002]
A) x-y=5 B) x+y=5 C) x+y=1 D) x-y=1

Answer 1

Line is perpendicular to y=x, means slope of that line is M=-1;
Now line passing through (3,2)
By using the formula (Y-y1)=M(X-x1)
Y-2=-1(X-3);
Y=-X+3+2;
X+Y=5; Option B is correct