exam Maths Puzzle Numerical Ability

5x+7y=b
mx+y=22

Find the vaule of m and b in the following systems so that the soultion to the system is (-3,4).

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exam Other Question

A sum of money of $10000 is invested, partly at 4% and partly at 6%. If the yearly income from the two investments was $530. Find the amount invested at each rate. perform each matrix row operations and write new matrix:

|1 -1 5| -6|
|3 3 -1| 10| -3R(base1)+R(base2)
|1 3 2| 5|