exam Maths Puzzle Numerical Ability

I am stuck on these types of problems. Please assist.

Solve by graphing. Indicate wether each system is independent, inconsistent, or dependent.

3x-y=4
3x-y=0

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exam Other Question

3x-1+x=3x+1+4

3x-1+xover9=3x+1+4over3 Problem: Farmland conversion. The amount of farmland in the United States is decreasing by 1 acre every 0.00876 hours as farmland is being converted to nonfarm use. At what rate in acres per day is the farmland decreasing?