Answer:
It is 12
Step-by-step explanation:
<em>(a). - 1 ; (b). y = - x + 11</em>
(1, 10)
(6, 5)
<em>(a).</em> <em>m</em> = = = <em>- 1</em>
<em>(b).</em> y - 5 = - 1(x - 6)
<em>y = - x + 11</em>