3. What is the value of k, if y varies directly as x and y-21 when x-3?
A. 1/9
B. 1/7
C.7
D. 9
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3. What is the value of k, if y varies directly as x and y-21 when x-3?
A. 1/9
B. 1/7
C.7
D. 9
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Answer:
C. 7
Step-by-step explanation:
y = kx
-21 = k(-3)
-21 = -3k divide both side by -3
7 = k