A line has a slope of $-\frac{3}{5}$ and its y-intercept is (0,18). What is its x-intercept?
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\(f(x)=-\dfrac{3}{5}x+18=0\ |\ -18\\ -\dfrac{3}{5}x=-18\ |\ \cdot -\frac{5}{3}\\ x= \dfrac{18\cdot 5}{3}\)
\(x= 30\)
its x-intercept is 30.
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