1) If y=12 when x=6 and z=4, find y when x=9 and z=6. a) 13.5 b) 9 c) 12 d) 10 2) If y varies directly as x and inversely as z, which equation represents the situation? a) y=kxz b) y=kx/z c) y=kz/x d) y=k+xz 3) A student’s remaining money y varies directly as the allowance x and inversely as expenses z. If y=60 when x=300 and z=50, find y when x=400 and z=40. a) y=kxz b) y=kx/z c) y=kz/x d) y=k+xz 4) If y=18 when x=6 and z=2, find y when x=9 and z=3. a) 18 b) 19 c) 20 d) 21 5) If y=20 when x=10 and z=5, find y when x=15 and z=6. a) 24 b) 25 c) 26 d) 27 6) If y=12 when x=8 and z=4, find y when x=10 and z=5. a) 12 b) 21 c) 13 d) 31 7) If y=30 when x=9 and z=3, find y when x=12 and z=4. a) 28 b) 32 c) 30 d) 34 8) If y=14 when x=7 and z=2, find y when x=9 and z=3. a) 9 b) 10 c) 11 d) 12 9) If y=8 when x=4 and z=2, find y when x=10 and z=5. a) 8 b) 9 c) 10 d) 7 10) If y=21 when x=7 and z=3, find y when x=9 and z=2. a) 40 b) 41 c) 39.5 d) 40.5

Combined Variation

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