book Maths Puzzle Numerical Ability

Please solve by graphing. Indicate whether each system is independent, inconsistent, or dependent. Thanks.

1. 3x - y = 4
3x - y = 0

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I need help with the problem: simplify:
log_7(7^log_7(343))
thank you Please explain how to sketch a graph of the following equation by finding 3 ordered pairs: x-y=4

Please show steps used so I am able to follow along. Thanks a million!