2x + 3y = 9
x + 5y = 8....multiply by -2
----------------
2x + 3y = 9
-2x - 10y = -16 (result of multiplying by -2)
---------------add
-7y = - 7
y = -7/-7
y = 1
x + 5y = 8
x + 5(1) = 8
x + 5 = 8
x = 8 - 5
x = 3
solution is (3,1)
If you multiply equation 2 by 3 , you get -6x+3y=24
if we subtract -6x+3y=24 from 2x -3y =12,
we get
2x-3y-(-6x+3y)=12-24
2x-3y+6x-3y=-12
8x-6y=-12,
After this actions we did not remove any variable, but with the elimination method we had to remove one variable, to get equation with another one variable. So 3 is incorrect
Answer:
It is called a rectangular prism
It has 8 vertices
Answer:
1 2/3
Step-by-step explanation:
fraction calc :)