book Maths Puzzle Numerical Ability

Can someone tell me if this is right? What is the slope of the line that has the equation 4x + 2y =12? Is the right answer 2????? Please let me know?

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simplify the complex fraction : Rt=1/((1/R1)+(1/R2)+(1/R3))

in R1, R2, and R3 1,2, and 3 are subscripts
The question is as follows: 2x^4 - 5x^2 +2=0 ,I factored the equation after replacing the x with p, which came to (2p-1)(p-2). Therefore p=1/2 and p=2.Then replacing P with x^2, x