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Math·Algebra·Linear equations in two variables

hard

The line shown can be represented by the equation $ax+by=48$, where $a$ and $b$ are constants. Which of the following is true about $a$ and $b$?

A

$a<0$ and $b<0$

B

$a<0$ and $b>0$

C

$a>0$ and $b<0$

D

$a>0$ and $b>0$