exam Maths Puzzle Numerical Ability

Please help me with this problem. Solve system by addition.
2x+3y=8
3x-2y=-1

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exam Other Question

a milk carton has a square base.its height is 11 cm.It has capacity(volume) of 176 cubic centimetres.Find x,the lenght of each side of the base 4b-5=-t for the b
+5 +5
4b=-t+5
4b/4=t+5/4
b= -t+5/4

is this right?