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Posted by on Tuesday, March 8, 2011 at 5:03pm.

a student has two test scores in a psychology class. The mean of these scores is 76 and their range is 28. Use this information to determine the two scores. ( write a system of linear equations to solve the problem)

  • math - , Wednesday, March 9, 2011 at 12:17pm

    (x+y)/2 = 76

    x-y = 28

    x = 28+y

    Substitute 28+y for x in first equation and solve for y. Insert that value into the second equation and solve for x. Check by inserting both values into the first equation.

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