Answer :
the slope intercept form is y = mx + b
1. x + 3y = -6
3y = -x - 6
y = - 1/3x - 2 <==
2. 9x + 3y = 6
3y = -9x + 6
y = -3x + 2 <===
3. x - 3y = 3
-3y = -x + 3
y = 1/3x - 1 <==
4. 3x - y = -6
-y = -3x - 6
y = 3x + 6 <==
1. x + 3y = -6
3y = -x - 6
y = - 1/3x - 2 <==
2. 9x + 3y = 6
3y = -9x + 6
y = -3x + 2 <===
3. x - 3y = 3
-3y = -x + 3
y = 1/3x - 1 <==
4. 3x - y = -6
-y = -3x - 6
y = 3x + 6 <==