State which method you would use to solve the following system of equations

substitution, elimination) and justify your reasoning. Then solve the system.

X-y=-2

2x + 4y = 38

Which method would you use?

Why?

Solve the system ...

A bike shop charges x dollars to rent a bike for half a day. it charges (x+40) dollars to rent for a full day. the table shows the shops bike rentals for one day. on that day the shop made a total of $600from bike rentals.

2. The formula M=log I/S determines the magnitude of an earthquake, where I is the intensity of the earthquake and S is the intensity of a "standard earthquake.

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150 is 20% of what number

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