book Maths Puzzle Numerical Ability

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!

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book Other Question

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
i want to ask what is the answer of the following;
1.4y-{13x-(14y-2x}
2.5y-{18x-(5y+12x}
3.-{8x-[14y-(5-6x)-2]}
4.-4(x-3y)-(3x+5y)-(6-8y)