exam Maths Puzzle Numerical Ability

Hi,
Can you help me with this math problem?Thanks.

Matrices
5. Solve the system of equations corresponding to the given matrix equation.

[5x+y] = [-38]
x+5y -4

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exam Other Question

can you please help me with this question. I have been confused for about three hours and I would really appreciate it if you would help me. thanks....

x^2 - 7x - 18 = 0
Hi can I have some help concerning functions?

A quadratic function is given.
f(x) = x^2 - 9x
(a) Express the quadratic function in standard form.
f(x) = a(x - h)^2 + k where

a =
h =
k =