The correct answer is: D) Subtracted like terms incorrectly
Step-by-step explanation:
Given
[tex]11.2y - 7.4y=141.36[/tex]
The terms 11.2y-7.4y need to be subtracted. But option b is to add them. We will add them and then solve the equation to see if its right.
So adding 11.2y-7.4y
[tex]18.6y=141.36[/tex]
Dividing both sides by 18.6
[tex]\frac{18.6y}{18.6}=\frac{141.36}{18.6}\\y=7.6[/tex]
so by adding the terms instead of subtracting we get y=7.6.
this means that the error was adding 7.4y-11.2y instead of subtracting
The correct method will be:
[tex]11.2y - 7.4y=141.36\\3.8y=141.36[/tex]
Dividing both sides by 3.8
[tex]\frac{3.8y}{3.8}=\frac{141.36}{3.8}\\y=37.2[/tex]
Hence,
The correct answer is: D) Subtracted like terms incorrectly
Keywords: Linear equation, Expression
Learn more about linear expressions at:
- brainly.com/question/4460262
- brainly.com/question/4464845
#LearnwithBrainly
