book Maths Puzzle Numerical Ability

What is the slope of the line that has the equation 4x + 2y =12? Can someone help me please?

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book Other Question

3squared+2squaredx5-squared root of 25
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8-4/2+2

this division problem is supposed to
I tried this, can someone just let me know if I am right?

(x^-1+y^-1)/(x^-1y)
I cancelled out the x^-1, which left me with y^-1/y, which I think is (1/y)/(y)

Thanks!!