Math Problem Statement

Evaluate the expression 2x + xy - 3y when x = -2 and y = 5.

Solution

The problem asks us to evaluate the expression 2x+xy3y2x + xy - 3y given x=2x = -2 and y=5y = 5.

Step-by-step Solution:

  1. Substitute x=2x = -2 and y=5y = 5 into the expression: 2x+xy3y=2(2)+(2)(5)3(5)2x + xy - 3y = 2(-2) + (-2)(5) - 3(5)

  2. Calculate each term:

    • 2(2)=42(-2) = -4
    • (2)(5)=10(-2)(5) = -10
    • 3(5)=15-3(5) = -15
  3. Add the terms: 4+(10)+(15)=41015=29-4 + (-10) + (-15) = -4 - 10 - 15 = -29

Final Answer:

29\boxed{-29}

Would you like a breakdown of any particular step or additional practice problems?

Related Questions:

  1. How do you simplify expressions with two variables?
  2. How do you handle negative numbers when performing arithmetic operations?
  3. What happens if xx and yy are both negative in this problem?
  4. Can you verify the answer by rewriting the expression differently?
  5. What are common mistakes when substituting values into expressions?

Tip:

Always double-check the signs (positive/negative) when substituting variables into an expression to avoid errors!

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Math Problem Analysis

Mathematical Concepts

Algebra
Substitution
Arithmetic Operations

Formulas

2x + xy - 3y

Theorems

-

Suitable Grade Level

Grades 7-9