exam Maths Puzzle Numerical Ability

hello can some one check this for me please?
i have to find the x intercepts
y=x^2+2x-3
y=0
o=(x+4)(x-2)
x=-4
or
x=2

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exam Other Question

How do you solve the equation m - 2n = 9 if the domain is { -1, 0, 5}?

Please help i do not understand how to do this problem?
use the graph to decide whether the point lies on the graph of the line. justify your answer algebraically. 12. 3x-4y= 10
a. (2,-1)
b.(-1,2)