graphing proportional and nonproportional relationships

Question

the value of y varies directly with x. and y=-3 when x=0.75

ive come up with the equation y=-4x

How do you graph that on a coordinate plane

Answer 1

Put a point at the origin. Go 1 unit to the right and 4 units down and put a second there. Draw an extended line through both points.

Explanation: for y = -4x, the slope is -4 = rise/run = change in y/change in x = -4/1.

This is also equivalent to 4/-1 whereby another point would be 1 unit left and 4 units up which will be on the same line.