If y varies directly with x, and if x = 7.5 when y = 10, how do you find x when y = 4?
Solution:
Given: y varies directly with x[direct variation]
y = ax where a is a constant of proportionality.
Now substitute the value of x and y
y = ax
10 = a(7.5)
a = 1.33
Determine the value of x by substituting the value of a and y
y = ax
4 = (1.33)x
So we get,
x = 3
Therefore, the value of x is 3.
If y varies directly with x, and if x = 7.5 when y = 10, how do you find x when y = 4?
Summary:
If y varies directly with x, and if x = 7.5 when y = 10, x is 3 when y = 4.
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