I don't like these computer choice thingies. It detracts from the math.


If we want to eliminate x we multiply the first equation by 5 then add it to the second:



OK, that's how it's done. Reading through the choices, that's choice D.
You split the shape into two rectangles and then find the missing side lengths and then you can find the area of each rectangle and add them up. i did a vertical line on the left side of the extra piece so then you would have two rectangles rectangle 1= 5x5 and rectangle 2= 2x6. then you find the area of each- 5x5=25 and 2x6=12. 25+12= 37 so the AREA=37
Write the equations:
8x-10y=20
-7x+10y=20
Add them using elimination
x=40
Now solve for y
8(40)-10y=20
10y=300
y=30
So there you have it: x=40, y=30.
A. because asexual reproduction creates many at the same time and all of them can be very different.