exam Maths Puzzle Numerical Ability

How would you graph 3x - 4y < 12. I need help!! I think I can solve the problem but I do not know how to graph on the computer :(

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exam Other Question

The units digit of a two digit number is 1 less than 3 times the tens digit. If the digits are reversed, the new number is 45 more than the original number. Find the number. A plane takes 6 hours to fly from San Francisco to New York, and 5 hours to return back. The wind velocity is 50 miles per hour, from New York to San Francisco. What is the speed of the airplane.