exam Maths Puzzle Numerical Ability

The practice exercises loock diferent than those on theexamples given so I get confuse.
thak's to all the tutors for they're time and efford to help us understad the home work.

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exam Other Question

In 1992, a software company had a profit of $30,000,000.In 1998, the company had a profit of 210,000,000. Find the average rate of change of the company's profit in dollars per yea Graph the following equations and find the slope of each line:
2x+4y=8
x-2y=6
y=2/3x=2
y=4

Also, finding the slope of the following points:
(6,5) and (3,3)
(4,2) and (1,6)