What is the slope of the line x=4 ?

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(08.01)consider the following pair of equations: x + y = −2 y = 2x + 10 if the two equations are graphed, at what point do the lines representing the two equations intersect? (−4, 2) (4, 2) (−2, 4) (2, 4)

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)