Solve using elimination.

8x − 7y = –5
–x + 4y = –15

Therefore, the values of "x" and "y" are -1000/312 and -115/39 respectively.

Step-by-step explanation:

By first equation,

Now, we can find the original value of y.

Now, we can find the original value of x.

Therefore, the values of x and y are -1000/312 and -115/39 respectively.

constant of proportionality = 3 and the equation is c = 3p.

step-by-step explanation:

c = kp   where c = amount of caffeine in mg., p = oz of pepsi and k is the constant of proportionality.

substituting the values given:

24 = 8k

k = 3.

the same value of k will be obtained if we substitute the other given values.