exam Maths Puzzle Numerical Ability

hey i need some help on how to graph these!
if you can help thanks! PLEASE.

Graph the equation :

y= -3

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exam Other Question

Solving systems of equations using matrices:

4x + y = 7
-5x - y + z - w = 1
z+w = 7

I have z = 7 and know that w is any real number so far but am stuck solving for x and y. Help please. Please help! This has me stumped. I think this is a logarithm problem.
Find the integer k such that 270k is a perfect square.