Answer:
x=2; y=1
Step-by-step explanation:
Since the triangle is equilateral, which means three sides have the same length.
So we have：4x-y=2x+3y=7
[tex]4x-y=2x+3y\\4x-y+y=2x+3y+y\\4x=2x+4y\\2x=4y\\x=2y\\[/tex]
Since 2x+3y=7 and plug in x=2y
we have
[tex]2x+3y=7\\2(2y)+3y=7\\4y+3y=7\\7y=7\\y=1[/tex]
and since y=1
x=2
