Answer: option. y=-1.33x; 2.67
Solution:
If y varies directly with x, the relation between y and x is:
y=kx
where k is a constant of proporcionality.
We know y=8 when x=-6. Replacing these values in the equation above:
8=k(-6)
8=-6k
Solving for k: Dividing both sides of the equation by -6:
8/(-6)=-6k/(-6)
-1.33=k
k=-1.33
Then the relation between y and x is:
y=kx→y=-1.33x
What is the value of y when x=-2?
Replacing x by -2 in the formula:
y=-1.33x→y=-1.33(-2)→y=2.66
Answer:
81
Step-by-step explanation:
Given total number of tests are 5
The grades earned by the students in the tests are 84 , 75 , 97 , 89
let the grade earned by the student in the fifth test be x.
Average=
The condition recquired is Average≥85
≥85
≥85
x≥81.
The least grade the student can earn in the last test so that average is not less than 85 is 81
Answer:
−10x + 4.35xy + 55y + 9.58
Step-by-step explanation:
Step 1: Collect like terms.
(6x − 16x) + 4.35xy + (16y + 39y) + 9.58
Step 2: Simplify and you're done!
−10x + 4.35xy + 55y + 9.58
