exam Maths Puzzle Numerical Ability

Are the following lines parallel, perpendicular or neither?

L1 with equation x-3y = 9
L2 with equation 3x+y = 3

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exam Other Question

y-5=2x
y-9=-2 Please tell me how to solve this problem by substitution. 5 . Which of the following equations contains the solution points given?
x 1 5 10 9
y 450 90 45 50

A. xy = k
B. x2 + k = y
C. 4x - k = y
D. y = kx - 5