The cost c varies directly as the number n of pencils is written as, c = kn, k = cn, n = k/c, c = k/n, The speed r of a moving object is inversely proportional to the time t travelled is written as, r = kt, r = k/t, t = kr, r/k = r, Which is an example of a direct variation?, xy = 10, y = 2/x, y = 5x, 2/y = x, A car travels a distance of d km in t hours. The formula that relates d to t is d = kt. What kind of variation is it?, direct, inverse, joint, combined, y varies directly as x and y = 32 when x = 4. Find the constant of variation., 8, 36, 28, 128, What happens to T when h is doubled in the equation T = 4h?, T is halved, T is tripled, T is doubled, T becomes zero, If y varies directly as x and y = 12 when x = 4, find y when x = 12., 3, 4, 36, 48, If y varies inversely as x and y = 1/3 when x = 8, find y when x = -4., -2/3, 2/3, -32/3, 32/3, What happens to y when x is tripled in the relation y = k/x ?, y is tripled., y is doubled., y is halved., y is divided by 3., w varies directly as the square of x and inversely as p and q. If w = 12 when x = 4, p = 2 and q = 20, find w when x = 3, p = 8 and q = 5., 10, 9, 27/4, 5, If 3 men can do a portion of a job in 8 days, how many men can do the same job in 6 days?, 7, 6, 5, 4, If y varies inversely as x, and y = 1/5 when x = 9, find y when x = -3., 5, 1/3, 3/5, -3/5, Mackee’s income varies directly as the number of days that she works. If she earns Php 8,000.00 in 20 days, how much will she earn if she worked 3 times as long?, Php 26,000, Php 24,000, Php 20,000, Php 16,000, If s varies directly as t and inversely as v, then which of the following equations describes the relation among the three variables s, t, and v?, s = k/tv, s = kv/t, 1/s = kt/v, s = kt/v, If (x – 4) varies inversely as (y + 3) and x = 8 when y = 2, find x when y = -1., 20, 18, 16, 14

Pre-Assessment_Q2_Variations

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