exam Maths Puzzle Numerical Ability

hi i need some help with graphing inequalities i understand some of it, but not all of it. like for example i need help with y_< 2x+4

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exam Other Question

x - y = -5
2y = -2 - 2x

A(4, -1)
B(-3, 2)
C(-5, 2)
D(2, 5)
E(-2, -4)
FNo Solution

I need to graph this system of equations and state the solution. However, I dont need how can I find how many solutions are in an equation like this one?
0=x^2-5x+6