book Maths Puzzle Numerical Ability

The quotient of two fractions is equal to the product of the first and the reciprical of the second. Why? a/b/c/d=a/bx1/c/d=a/bxd/c ?

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Please help, I am totally lost when it comes to graphing inequalities

Graph each system
y > 2x-1
y< -x-4

Thank you How do you draw a line with a given slope? Ex, -3 as the slope