The figure below represents a long distance calling plan. how much does it cost per minute of a long distance phone call on this plan?

a) $2 per minute

b) $0.20 per minute

c) $0.10 per minute

d) $1 per

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints

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