3x-3y=3 y=-5x-17 substitution plz if you can i would appreciate it

First substitute the second equation into the first one: 
-3x - 3(-5x - 17) = 3 
Next distribute the parenthesis: 
-3x + 15x + 51 = 3 
Then combine like terms: 
12x + 51 = 3 
Now subtract 51 from each side: 
12x = 48 
Lastly to get x, divide each side by 12: 
x = 4 
Now put this into the second equation: 
y = -5(4) - 17 
Multiply: 
y = -20 - 17 
And subtract: 
y = -37 
The solution is (4,-37). Hope this helps!