Answer
(a) $(3,0)$; $(0,\frac{21}{2})$. (b) see graph.
Work Step by Step
(a) Given $7x+2y=21$, to find the x-intercept, let $y=0$. We have $x=3$ or $(3,0)$; to find the y-intercept, let $x=0$. We have $y=\frac{21}{2}$ or $(0,\frac{21}{2})$.
(b) see graph.
