SAT Math· difficulty 4/5
The table represents a linear function .
<table> <thead> <tr> <th>$x$</th> <th>-1</th> <th>1</th> <th>3</th> <th>5</th> </tr> </thead> <tbody><tr> <td>$f(x)$</td> <td>a</td> <td>5</td> <td>9</td> <td>b</td> </tr> <tr> <td>What is $a + b$?</td> <td></td> <td></td> <td></td> <td></td> </tr> </tbody></table>Explanation
Slope . ; . .
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