Evaluate the given expression
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The document contains examples of evaluating mathematical expressions for given values of variables. 1) It evaluates the expressions x + y, 2xy, and 5x/3y for x = 3 and y = 5, obtaining answers of 8, 30, and 1. 2) It evaluates the expression 3x + 2y for x = 3 and y = 5, obtaining the answer 19. 3) It evaluates the expression m + 2n for m = 5 and n = 2, obtaining the answer 9. 4) It evaluates the expression 18m + 7 for m = 1/3, obtaining the answer 13.
Evaluate the given expression
- 1. Evaluate the given expression for x = 3 and y = 5. 1). x + y 2). 2xy 3). 5x/3y = 3 + 5 = 8 = 2(3)(5) = 2(15) = 30 = 5(3)/3(5) = 15/15 = 1
- 2. Evaluate the given expression for x = 3 and y = 5. 3x + 2y Answer : Substitute 3 for x and 5 for y into the given expression. 3x + 2y = 3(3) + 2(5) = 9 + 10 = 19 3x + 2y = 3(3) + 2(5)
- 3. Evaluate the given expression for m = 5 and n = 2. m + 2n Answer : Substitute 5 for m and 2 for n into the given expression. m + 2n = 5 + 2(2) = 5 + 4 = 9 Substitute 5 for m and 2 for n into the given expression.
- 4. Evaluate the given expression for m = 1/3. 18m + 7 Answer : Substitute 1/3 for m into the given expression. 18m + 7 = 18(1/3) + 7 = (18/3) + 7 = 6 + 7 = 13