Step 1;
-3X + Y = -3
Step 2:
you are to write the equation in slope intercept form
y = mx + b
m is the slope and b is the intercept on the y axis.
Step 3:
make y subject of the relation from the equation
-3x + y = -3
balanace the equation by adding +3x to both sides of the equation
-3x + y + 3x = -3 + 3x
at left hand side, -3x + 3x = 0
therefore,
Final answer
y = 3x - 3