slove by using system of equations and substatuion

4x-y=7
5x-8y=2

*please show work!

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Arm circles are often effective dynamic stretches for swimmers because they

Mary has spontaneously decided to prepare a meal for friends. she is beginning to prepare fin fish and realizes she wants to also prepare a hearty dish ready to serve at the same time. what should she prepare?

Where does a fertilized egg spend most of its time?