What is the equation of a line:

* perpendicular to the line y = 1/2*x - 7 and

* passing through the point (3,-4).

prependicular means that x * 1/x = -1 so,

the slope of the line is -2

y=-2x+b

now plug in the coordinates

-4 = -2*(3) + b

solve for b:

-4 = -6 +b

b = 2

the line is: y=-2x+2

-Baljeet