Andy starts with $40 and is saving at a rate of $5 per week. samantha starts with $136 and is spending at a rate of $3 per week per week.
a) when will andy and samantha have the same amount of money?
b)and how much money will that be?

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

c. side angle side. u shares the same sides