Respuesta :

hklinh92

Answer:

Elena's right

Step-by-step explanation:

Well, in the equation: 7.5d = 2.5d. Lin can divides 2.5d from both sides if the d≠0. If d=0, Lin cannot divides 2.5d from both sides.

So, Elena subtracts 2.5d from each side of equation is correct.

Lin method:

7.5d = 2.5d ⇔ [tex]\frac{7.5}{2.5}[/tex] = 1

Wrong equation.

Elena method:

7.5d = 2.5d ⇔ 5d = 0 ⇔ d=0

Conclusion: Elena's right

abidemiokin
  • Elena is right since we can always get the value of "d" is 2.5d is subtracted from both sides of the equation.

Equations are expressions separated by an 'equal to' sign.

Given the expression solved by Elena and Lin.  

7.5d = 2.5d

To get the value of d, the best thing to do is to subtract 2.5d from both sides as shown:

7.5d - 2.5d = 2.5d - 2.5d

5.0d = 0

Divide both sides by 5.0

5.0d/5.0 = 0/5.0

d = 0

Note that dividing both sides by 2.5d will eliminate the variable 'd' which shows that Lin is wrong and Elena is right.

Learn more; https://brainly.com/question/945593

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