Identify the operations used (addition, subtraction, division, multiplication) in forming the following expressions and tell how the expressions have been formed.
z+1, z-1, y +17. y - 17
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ExpressionOperationReasonz+1AdditionIt is formed by adding z to 1.z−1SubtractionIt is formed by subtracting 1 from z.y+17AdditionIt is formed by adding y to 17.y−17SubtractionIt is formed by subtracting 17 from y.