Combining Like Terms 8th Pre-Algebra.

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Presentation transcript:

Combining Like Terms 8th Pre-Algebra

Warm up Simplify. 9 + 13 – 5 + 3 16 - 8 + 4 -1 6 + 9 – 10 + 3 17 + 8 – 20 – 2

Check HW

Vocabulary Term Like term Equivalent expression Simplify

Combine like terms to simplify 14a – 5a 7y + 8 – 3y + 1 + y 3x + 4 + 2x 13k + 6 – 8k + 9 + k

9x + 3y – 2x + 5 5t + 7p – 3p – 2t 4m + 9n – 2 k + 3n – 2n + 4k

Simplify Simplify algebraic expressions by combining like terms. 6(5 + n) – 2n 4(y + 9) – 3y 4(3x + 6) – 7x 6(x + 5) + 3x

Solving equations Solve the equation by combining like terms. 8x – x = 112 x + 3x = 48 6y + y = 42

Write What is the first step in simplifying the expression 2 + 8(3y + 5) – y Explain why 8x + 8y + 8 is already simplified.

What is the error? A student said that 2x + 3y can be simplified to 5xy by combining like terms. What error did the student make?

HW Textbook p. 30 (25-36 all)