4. take 8 and divide it by 2
for (-3)^4, if there were more numbers in the parentheses, the exponent would apply to all numbers in the parentheses
for -3^4, the exponent would only apply the -3.
hope this helps!
Y = 2x-6
Just move the y to the other side (add y so it gets pushed to the right) then subtract the six from the right to the left side.