exam Maths Puzzle Numerical Ability

Could you please solve by using sustitution method. Please show details.
Thank you.

x - y = 3
3x - 2y = 3

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exam Other Question

Find values for m and b in the following system so that the solution to the system is (-3,4).
5x+7y=b
mx+y=22 The Cubic root of 25 + 3 divided by the cubic root of 5.