Question
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)
Answers
PsyDAG
(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.
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.