exam Maths Puzzle Numerical Ability

3x+4y=5
x-2x=-5

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When a system of two graphed lines are parallel, the system has_______solution(s), and the equations are said to be___________. IF A ROCK IS DROPPED FROM A CLIFF INTO AN OCEAN, IT TRAVELS APPROXIMATELY 16t SQUARED FEET IN t SECONDS. IF THE SPLASH IS HEARD 4 SECONDS LATER AND THE SPEED OF SOUND IS 1,100 FT/SEC, APPROXIMATE THE HEIGHT OF THE CLIFF.