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Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.