CAN ANYONE MAKE SURE THESE ARE RIGHT?

Find the equation of the line for each situation.
A line with a y - intercept of 4 and a slope of -1
Y=-1x+4
A line passing through the point (3, 4) and having a slope of -2
Y=-2x+3
A line passing through the points (1, -1) and (9, 3)
Y=1x+9