How to solve simultaneous equations (substitution method) 連立方程式の解き方(代入法)
Question: Let's solve the following equations by the substitution method.
① 3x+2y=-2 ② x-4y=18
How to solve: As with the addition and subtraction method, the substition method also solves simltaneous equations by erasing a single letter. In the substition method, bu substituting one equation into the other, a letter is erased.
For this problem, if we reaarange ②, it becomes x=4y+18 ---③. Substituting ③ into equation ①, y =-4. Then, x=2.
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