# Math

x is a partly constant and partly varies with y when y =3, x=7 and when y=6, x=9, find the relationship between x and y.Hence find x when y=4. solution?.

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1. x is a partly constant and partly varies with y: x = ay+b
Now just plug in your numbers and solve for a&b:
3a+b = 7
6a+b = 9
Once you know a and b, you can find x when y=4

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