Q1. What is the first step in substitution method?
✔ You must express one variable in terms of another before substituting.
Q2. What is the value of x in our example?
✔ Solving 3x - 5 = 4 gives 3x = 9, so x equals 1.
Q3. Which error is most common in elimination?
✔ Distributing negative signs incorrectly is a frequent mistake students make.
Show transcript
[Slide 1] Solving Two Equations Together
We need to find specific x and y values that make both equations true simultaneously. Think of it like finding the intersection point of two lines.
[Slide 2] The Substitution Method Rule
First, express one variable in terms of the other from a simpler equation. Then, replace that variable in the second equation to solve it.
[Slide 3] Solving Step by Step
Put five minus x where y was in the second equation. Simplify to find x is one, then plug back to get y.
[Slide 4] Watch Out for Signs
Students often forget the negative sign applies to the whole bracket. Always double check your signs when expanding terms.
[Slide 5] Quick Method Recap
Remember the four steps clearly to avoid errors in exams. Always verify your solution by putting values back into original equations.