book Maths Puzzle Numerical Ability

how would i graph the following....

y=5-x
y=-1
y=4-3x
x=3y
x-y=-3

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Could someone help me with this.
For which system or systems of equations is (2,3)the solution?
A. y = x+1 and y = -x+5
B. y = 2x - 1 and y = 1/2x +2
C. y = 3x - 3 and y = -2x + 7
D. y = 1/4x + 5/2 and y = -3x +3 please help!!

x - 3sqrt(x) - 4 = 0