If y varies directly as x, and y is 20 when x is 4, what is the constant of variation for this relation? a. 1/5 b. 4/5 c. 5 d. 16

Question:

If y  varies directly as x, and y is 20 when x is 4, what is the constant of varaitaion for this relation?

C. 5

Step-by-step explanation:

When y = 20, x = 4.

                                              20 = k x 4

                                               k = 20/4

                                               k= 5

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation: