exam Maths Puzzle Numerical Ability

Find the slope and y intercept of the line represented by each of the following equations.

1.y=-2x+9 2.y=-3x+8 3.3x-y=7 4.2x-y=11

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exam Other Question

Find the vertex, and the x and y intercepts by completing the following:

f(x) = -x^2 + 6x - 8
Find the value of k so that the equation below has the solution set {-5}.

4(x+3)=x(3-k)

so far i have this but my main problem is what is the definition of a solution set?

4x+12=3x-kx minus 3x from each side. x+12/x= -kx/x then -12/x=k