exam Maths Puzzle Numerical Ability

Use the intercepts to graph the equation x+2y=4.

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exam Other Question

At 10:30A.M. two planes leave Houston one flying east at 560km/h and the other flying west at 640 km/h at what time will they be 2100 km apart can you please help me solve by additon-or-subtraction method: (((2x+y=18 2x-y=22)))