kenneyfamily
Find an equation of variation in which y varies jointly as x and z. y = 7 when x = 7 and z = 1
A. y=x/z
B. y=xz
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kenneyfamily
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@Skaematik what about this?
Skaematik
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When we say z is jointly proportional to a set of variables, it means that z is directly proportional to each variable taken one at a time
It means they are DIRECTLY PROPORTIONAL. So the answer is
kenneyfamily
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y=xz?
kenneyfamily
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@Skaematik
Skaematik
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yes
kenneyfamily
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thanks! can you help me with one more please? @Skaematik
Skaematik
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sure