Write an equation y=Mx+b

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

Parabolas y=−2x^2 and y=2x^2+k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

The actual length of side t is 0.045cm. use the scale drawing to find the actual side length of w