In expressions such as "x-y", both "x" and "y" can have any value. The value of "x-y" will depend on what the value of "x" and the value of "y" are.
y = 100 - 4x ( a ) Find the value of y when x = 20.
The value of y is y, as it will always be.
It depends on the relationship between x and y.
The answer is 37478482993
If you mean: x+y = 30 and the value of y is 15 then the value of x is also 15
y is a function of x iffor each value of x (in the domain) there is a value of y, andfor each value of y (in the range) there is at most one value of x.
if 2x + y = 7, what is the value of y when x = 3?
Then y = 3x.
the Y value decreases.
The idea is to replace "x" by its value, to replace "y" by its value, and then to do the calculations.
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