There are no exclude values of the equation, as given.
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y = 100 - 4x ( a ) Find the value of y when x = 20.
y = 5x + 3When x=2,y = 5(2) + 3 = 10 + 3 = 13
-6
It is the intercept: the value that y takes when x = 0
x = 9/2 or x = -2 Solved by using the quadratic equation formula.