In this lesson, we will learn how to write an equation to describe joint variation and how to use proportions to find other sets of values to solve real-world problems.
Q1:
𝑦 varies jointly as 𝑥 and 𝑧. If 𝑦=15 when 𝑥=9 and 𝑧=8, find 𝑦 when 𝑥=16 and 𝑧=9.
Q2:
𝑦 varies jointly as 𝑥 and the cube root of 𝑧. If 𝑦=120 when 𝑥=5 and 𝑧=8, find 𝑦 when 𝑥=10 and 𝑧=64.
Q3:
𝑦 varies jointly as 𝑥 and the square of 𝑧. If 𝑦=18 when 𝑥=2 and 𝑧=3, find 𝑦 when 𝑥=6 and 𝑧=7.
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