Answer: The correct answer is option 2; XX and XXX
Step-by-step explanation: The question refers to the model as an equation and that is the first step in understanding the requirement of the question.
An equation in mathematics simply means two values that are equal to one another and it is identified by the "equal to" sign ( = ).
So, if for example you have 2 + 3 = 5, then you have an equation because the value on both sides of the equal to sign are the same. Similarly if you have 2x + 3y = 5y - x, you also have an equation and that means the value of 2x + 3y is the same as 5y - x.
From the second example in this illustration, you would notice that the left hand side consists of some numbers and alphabets , same for the right hand side. If you were to collect like terms in this instance, it simply means those values in the expression on either or both sides that are similar. Hence, in this example, 2x on the left hand side and x on the right hand side are "like terms", while while 3y on the left and 5y on the right are also like terms.
In the question given, the left hand side shows two symbols "X" in green color and three symbols "1" in yellow color. Comparing these with the right hand side that has three symbols "X" in green color, we can see that the like terms are the green colored "X" symbols.
