exam Maths Puzzle Numerical Ability

How do you change slope intercept equation like y=-3/4x+3 into a standard equation?

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exam Other Question

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 i need help with this problem 5a divided by 7 equals -10 the 5a is over the 7. if u could please explain this problem to me i would greatly appreciate it.