exam Maths Puzzle Numerical Ability

Hello out there,I need some help with some problems,the first one is,Solve the system of equations by substitution:y=x^2+2x-2 and y=3x+4.The next one is,Which of the following poin

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A retailer has some vidio games that cost her #25 each. She wants to sel them at a profit od 80% of the cost. What price should she charge fo rthe video games? Dear Tutor.
I have two questions. Can you , please help me ?
How to explain how equations come up with infinitely many solutions and no solution. Does having no solution mean that 0 is a solution?
Thank you.