book Maths Puzzle Numerical Ability

I'm having trouble with the following question:

Solve each system by the substitution method. Determine whether the equations are independent, dependent, or inconsistent.

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book Other Question

Jo Beth left her college town on a bus that traveled 60 mi/h. Three hours later, her father left home driving at a speed of 50 mi/h to meet the bus. If the college was 345 mi from solve and write in scientific notation: (0.00003 x 10^ 13) (70000)