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a. Find an equation for the secant line through the points where $x$ has the given values. b. Find an equation for the line tangent to the curve when $x$ has the first value. $y=7x?;x=9,x=16$ a. The equation for the secant line is $y=$.

(a) The given function is :y=7xLet f(x)=y=7xThen ;f(9)=79=7(3)=