exam Maths Puzzle Numerical Ability

how do you no when to switch the signs on arrow things like this >

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What is the constant varation in the equation 5x-3y=0?
a.-3 b.-5/3 c.-3/5 d.5 A merchant blends tea that sells for $3.00 a pound with tea that sells for $2.75 a pound to produce 80 lb of a mixture that sells for $2.90 a pound. How many pounds of each type of