exam Maths Puzzle Numerical Ability

i would also like help with this please
Write an equation in slope-intercept form that satisfies each condition.
slope -1/2,passes through (2,-3)

i did it like
-3=-1/2(2)-b
but i dont think thats right please help

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exam Other Question

Need to state the roots and completely factor the following:

f(x)= x^5+x^4-9x^3-5x^2-36
OMG - HELP
Thanks
LLo
Solve.
x^2+9<3x