Which ordered pair is the best estimate for the solution of the system of equations?
y= -3/4x -2
y=x+6

A) (-4.75,1.75)
B) (-4.25,1.5)
C) (-4.5,1.5)
D) (-4.5,1.75)

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)