book Maths Puzzle Numerical Ability

Directions: Graph each function, i need the x and y coordinates for this equation i can graph them myself, but the both the x and y coordinates can't go over 6 or -6

f(x)=-5x sq

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book Other Question

The K.L. Mutton company has investments in three states North Carolina, North Dakota, and New Mexico. The company's deposits in each state are divided among bonds, mortgages and co The problem asks me to solve usling any method.
5x+6y=14
y=4x-17
I am not sure which method to use. I tried both but did not come out with the same answer both times! Thanks for your help!