Answer :
In an isosceles triangle with two equal sides of length [tex]$x$[/tex] and the third side of length [tex]$y$[/tex], the perimeter is given by
[tex]$$2x + y = 7.5.$$[/tex]
Since the shortest side, [tex]$y$[/tex], measures [tex]$2.1$[/tex] m, we substitute [tex]$y=2.1$[/tex] into the equation:
[tex]$$2x + 2.1 = 7.5.$$[/tex]
This is exactly the equation given in the option:
[tex]$$2.1+2x=7.5.$$[/tex]
Thus, the correct answer is the fourth option.
[tex]$$2x + y = 7.5.$$[/tex]
Since the shortest side, [tex]$y$[/tex], measures [tex]$2.1$[/tex] m, we substitute [tex]$y=2.1$[/tex] into the equation:
[tex]$$2x + 2.1 = 7.5.$$[/tex]
This is exactly the equation given in the option:
[tex]$$2.1+2x=7.5.$$[/tex]
Thus, the correct answer is the fourth option.
