Answer:
x = 14
y = 40
Step-by-step explanation:
if the polygons are similar then we can use the proportional values to find x and y:
20/45 = (2x-8)/(5x-25) cross multiply expressions
100x - 500 = 90x - 360 export like terms to the same side of the equation
100x - 90x = 500 - 360
10x = 140 divide both sides by 10
x = 14
since the polygons are similar 3y + 8 = 128 subtract 8 from both sides
3y = 120 divide both sides by 3
y = 40
