book Maths Puzzle Numerical Ability

find the slope of a line that is parallel to and slope of a line that is perpendicular to the following line: 3x+y=4

Thanks Caroline

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book Other Question

2(1+i)-3(2-3i)

3xsquare-2x-1=0
Find a1 of arithmetic sequence from given information.
a7=-45 a15=-77