SOLUTION: A student's grade in a course is the average of 4 test grades and a final exam that is worth twice as much as each test. Suppose a student has test grades of 91, 88, 79, and 92. Wr

Algebra ->  Average -> SOLUTION: A student's grade in a course is the average of 4 test grades and a final exam that is worth twice as much as each test. Suppose a student has test grades of 91, 88, 79, and 92. Wr      Log On


   

Question 941793: A student's grade in a course is the average of 4 test grades and a final exam that is worth twice as much as each test. Suppose a student has test grades of 91, 88, 79, and 92. Write an equation to model this situation where x is the student's grade on the final exam and y is the student's average for the course.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+y+=+%28+91+%2B+88+%2B+79+%2B+92+%2B+2x+%29+%2F+5+
+y+=+%28+350+%2B+2x+%29+%2F+5+
+y+=+70+%2B+%28+2%2F5%29%2Ax+
Note that student can not do better than +x=100+
on the final exam.
The average can't be greater than +y+=+100+
Here's the plot:
+graph%28+400%2C+400%2C+-10%2C+140%2C+-10%2C+140%2C+70+%2B+%282%2F5%29%2Ax%29+