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Y varies directly with x, and y = 15 when x = 3. What is the value of x when y = 4?
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Apr 9, 2017
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Y varies directly with x, and y = 15 when x = 3. What is the value of x when y = 4?
Mathematics
high-school
Pumba
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Y varies directly with x so use
y/x
so when y=15 and x=3
substitute =15/3
when y=4 use y/x again so 4/x (you do not know the x)
15 4
--- * ---
3 x
cross multiply
15x=12
isolate x by dividing 15 on both sides
get x=12/15
AspiringCanadian
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Apr 10, 2017
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AspiringCanadian
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When x = 3 , y = 15 , divide both by 3.
When x= 1 , y = 5. Now multiply both by 4/5
When x = 4/5 , y=4
Mkvlrn
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Apr 15, 2017
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Mkvlrn
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