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Substitution of values in the algebraic expressions

Answer Text:
Substitution of values in the algebraic expressions:
This is the process of giving variables specific values in an expression.

Example 1.

Evaluate the expression #(x^2 + y^2)/(y + 2)#
if x =2 and y = 1

Example 2.

Three years ago, Juma was three times as old. As Ali in two years time, the sum of their ages will be 62. Determine their ages