book Maths Puzzle Numerical Ability

Here is the problem.
John invested a total of $4800 in two business ventures. One investment returned 15% and the other returned 9% after one year. If the dollar amount of the ret

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book Other Question

If the ordered pair (3,a) is the solution to the system 3x-4y=1
5x+2y=19 find a.

Graph the system: y=2x-7 I am having a difficult time solving this problem:

Graph the solution set for the following inequality:
x/5 + y/4 < 1

I know to treat the "<" as an equal sign in order to fi