If the fraction 391/x-10 is equivalent to -23, find the value of x

x = - 7

multiply both sides by (x - 10) to eliminate the fraction

391 = - 23(x - 10 ) ← ( distribute parenthesis )

391 = - 23x + 230 ← ( subtract 230 from both sides )

161 = - 23x ← ( divide both sides by - 23 )

= x

- 7 = x ⇒ x = - 7

10 cm

step-by-step explanation:

if the polygon is a rectangle, then the perimeter is x+x+y+y. using the values that you gave, the perimeter is 3+3+2+2=10cm.