You can make 5 full scarves in total.
For this case we have the following equations:
2x - 3y = 1
2x + 3y = 2
When adding both equations we observe that:
Sentence 1: we have an equation of a variable, which in this case will be x. We can clear the value of x.
Sentence 2: Knowing the value of x, we can substitute in any equation and find the value of y.
Sentence 3: The value of x and y represents the point of intersection of both lines (x, y).
Multiply the denominator by 4
the initial statement is:

and then:

So the second statement is false because f should be multiply by e, not by d so is option C)