how do I find the slope intercept form of
(-7,-4); m=-1/2

and the standard form of
(-5,2);m=2/5
(16/3,-9);m=0
(3,-3);m=-3/8

Use this formula: y=mx+b.
You know m=-1/2, so plug that in: y=-1/2x+b
Now plug in the x and y coordinates and solve
y=-1/2x+b
(-4)=-1/2(-7)+b
-4=3.5+b
-3.5=-3.5
-7.5=b

so this is the equation in y intercept form: y=-1/2x-7.5

To find standard form I just move the x value to the other side

y=-1/2x-7.5
+1/2x=+1/2x
y+1/2x=-7.5

So the first problem in standard form is y+1/2x=-7.5

Now try and do the remaining 3 problems.