exam Maths Puzzle Numerical Ability

Solve the systems by graphing the following equations:
2x - y = 4
2x - y = 6

I am having trouble with these problems, could someone please help me with this. Thanks

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exam Other Question

Triangle ABC is isosceles with base AC. If AB=7x+3, CB=8x-9, and AC=5x+6, find the lengths of the sides of the triangle The speed of a stream is 6 mph. If a boat travels 98 miles downstream in the same time that it takes to travel 49 miles upstream, what is the speed of the boat in still water?