Step-by-step explanation:
5r+1=a(m+r)
or , 5r+1=am+ar
or, 5r-ar=am-1
or , r(5-a)=1(am-1)
: <u>r</u><u> </u> =<u>(</u><u>am-1)</u>
1 (5-a)
-18
F(x)=3x-12
F(-2)=3x-2-12
=-6-12
=-18