Solving Systems of Linear Equations by Substitution
Learn how to solve systems of linear equations by substitution method with step-by-step explanations and examples. Understand the process of substituting variables to find solutions. Practice solving equations and verifying answers for accuracy.
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Presentation Transcript
To choose an appropriate strategy to solve calculations.
Choose an appropriate strategy When dealing with calculations, you should choose the most appropriate method depending on the numbers involved. The order of preference is: 1.mental calculation 2.mental calculation with a jotting 3.written method
Which method would you choose for 25 + 13 = Mental Written
Which method would you choose for 250 + 130 = Mental Written
Which method would you choose for 192 - 139 = Mental Written
Which method would you choose for 240 + 130 = Mental Written
Which method would you choose for 100 - 65 = Mental Written
Which method would you choose for 199 - 165 = Mental Written
Now divide your book into 2 columns and sort these sums into mental or written. 191 - 135 = 120 - 15 = 70 + 50 = 20 + 145 = 122 - 75 = 367 - 122 = 201 + 35 = 222 - 130 = 548 - 139 = 24 + 24 + 24= 30 + 30 + 30 =
