The expression 4xy + 7 is
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The expression 4xy +7 is formed from variables x and y and constants 4 and7. etc.; actually countless different values. The value of an expression changes with the value chosen for the variables it contains. Thus as y takes on different values, the value of 2y – 5 goes on changing.
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linear equation
Step-by-step explanation:
linear equation in two variables
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