Mashaal Masha
The graph of $7x+2y=-31$ in the $xy$-plane has an $x$-intercept at $(a,0)$ and a $y$-intercept at $(0,b)$, where $a$ and $b$ are constants. What is the value of $ \frac{b}{a} $?
Difficulty: Hard
A: 

$ -\frac{7}{2} $

B: 

$ -\frac{2}{7} $

C: 

$ \frac{2}{7} $

D: 

$ \frac{7}{2} $

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