exam Maths Puzzle Numerical Ability

What is the soultion of the following system of linear equations?
x+2y=5
3x-15=-6y

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exam Other Question

WOW this is a tough one! Can someone please help!
If:
z = 6(cos 205 degrees + i sin 205 degrees) and w = 3(cos 85 degrees + i sin 85 degrees), find z/w in polar form.
Thanks aga Solve this problem using the Substitution Method

1/5x+1/2y=4
2/3x-y=8/3