exam Maths Puzzle Numerical Ability

Solve for x and y

[ 4 1 3] * [9 -2]= [ y 5]
-2 x 1 2 1 -13 11
-1 4

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exam Other Question

13x-4(2x-5)=15 solve for x Biologists want to set up a station to test alligators in the lake for West Nile Virus. Suppose that the cost for such a station are $2,500 for set up costs and $3.00 to administer