book Maths Puzzle Numerical Ability

Dear Tutor,
Do you know where I can find sample matrix equations online? I've looked all over and I can't find any. I could really use some practice.
Thank you,
Melissa-A

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book Other Question

Hi I am having diffuclties setting up this problem:

If 46 painters used 70 nails in 90 days how many nails would 23 painters use in 60 days? Write an equation in slope-intercept form of the line that passes through the given point and is parallel to the graph of each equation.

y= -(two thirds)x+4; (1,-3)