Question on picture.
don't understand what to do.

Y+10 = 2y-5.6 so get both y values to the same side 
-y+10=-5.6 then subtract 10 from both sides and get 
-y=-15.6
multiply by -1 to find out that y=15.6 then plug it into the equation of 2y-5.6 and simplify to 
2(15.6)-5.6 and that should be the answer

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0

answer: the function g(x) has the greatest slope.