exam Maths Puzzle Numerical Ability

Solve the system by graphing.
3x + y = -1
9x + 3y = -3

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exam Other Question

Ok, I answered this but I want to make sure that I got it right before turning it in.

Solve the system by addition or substitution.
3x - 4y = 8
6x - 2y = 10
For the input-output matrix A, find the output required to meet the demand D.

A=[0.2|0.4]
[0.3|0.6]


D= [700]
[400]