exam Maths Puzzle Numerical Ability

how do you solve this problem
5x^2-7x-6>0

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exam Other Question

Find two numbers such that twice the first exceeds three times the second by 1, and three times the first exceeds twice the second by 14. 3x+6y=9
4x+5y=15
x-y+4=0
5x+15+5y=10x
2x+2y-4=x+5

Examples that my teacher gave me to help me out, but i still don't understand. so can you please hel