exam Maths Puzzle Numerical Ability

I was given an equation of a line and a point and told to determine whether the point is on the line using substitution. Heres two problems


y=x-4;A(5,1)




y=4x+2;A(1,6)

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exam Other Question
Find the value of c so that the quadratic equation 2x^2+4x-c=0 has two equal real roots. How many real zeroes are there in f(x) = (x + 3)(x – 4)(x + 6)(x^2 + 7)?
@ This is fairly straightforward. Only the last factor results in imaginary solutions
a. 3
b. 5
c. 4
d. None of the above