exam Maths Puzzle Numerical Ability

Two airplanes leave an airport at the same time.The heading of the first is 120 degrees and the heading of the second is 320 degrees.If the planes travel at the rates of 700 mph an

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how to find an equation for the line parallel to the line -3x+9y=-9 having the same y-intercept as 4x-9y=8 use matrix methods to solve


x+4y=8
2x+y=9