Suppose y varies directly with x. If y = –4 when x = 8, what is the equation of direct variation? | Complete the steps to write the equation of direct variation.
Answer
A
k = –4(8)
B
–4 = k(8)
C
8 = k(–4)
Explanation
Direct variation has the form y = kx, where k is the constant of variation. Substituting y = –4 and x = 8 gives –4 = k(8), which is choice B.
AI-written and checked against the verified answer.