exam Maths Puzzle Numerical Ability

My question,


You order items from a menu that total $7.85. Your bill comes to $8.30, including the tax. What is the percent of the tax? Round to the nearest tenth. Next after

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exam Other Question

Monthly salary of a person is Rs.550 and his monthly expenditure is Rs.400. During a year he was on leave without out pay for some time and his yearly savings were Rs.975. For how c. the instructions says to determine whether the pair of lines are parallel, perpendicular or neither

2x+3y=1

4x-5y=2

can you show me step by step how to determine whether these are parallel or perpendicular or neither.

thanks