What is the solution of the system?
y = −3x
3x + 2y = 6

a.(2, 6)
b.(−1, 3)
c.(−2, 6)
d.(1.5, −4.5)

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%)