Inverse of x=-4, what is x?

congruent sides have equal legnth

the shorter side is the last side

if the congruent sides are x and the shorter one is y, and x is  1 longer than y then

x=1+y

perimiter=x+x+y

x=1+y

perimiter=1+y+1+y+y=3y+2

square is 4s

each side (s) is 2 less than y

s=y-2

square is 4(y-2)=4y-8

4y-8=3y+2

minus 3y both sides

y-8=2

add 8 both sides

y=10

the legnth is 10 units