exam Maths Puzzle Numerical Ability

Can you please tell me if this is correct? I am not very good with these. The answer I got was -6

What is the slope of the line 12x+3y=-72

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exam Other Question

lines p & q intersect to form adjacent angles 1&2. If m<1=3x+18 & m<2=-8y-70, find the values of x & y so that p is perpendicular to q 3^x=40

e^0.04t=1500

please help me solve these... if possible...i need good step by step process