2.2 Direct Variation Identifying Direct Variation From Tables For each function, determine whether y varies directly with x. If so, what is the constant of variation and the function rule? In example A., y varies directly with x. The constant of variation is 2. The function rule is y = 2x. In Example B., y/x is not constant. y does not vary directly with x. Identifying Direct Variation from Equations Identifying Direct Variation from Equations Using a Proportion to Solve a Direct Variation Using a Proportion to Solve a Problem A salespersons commission varies directly with sales. For $1000 in sales, the commission is $85. What is the commission for $2300 in sales? Step 1c = commissions = sales c = k(s) 85 = k(1000) k = Step 2 c = k(s) c = 0.085(s) c = 0.085(2300) c = The commission for $2300 in sales is $ More Practice!!!!! Homework Textbook p. 71 72 #7 29.