AbbyR9138
20.08.2019 •
Mathematics
How is 3x-y=8 and x+2y=5 solved by combination (
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Ответ:
That turns the first equation into:
6x - 2y = 18
That way it can easily be added to the second equation:
6x - 2y = 16
x + 2y = 5
7x = 21
As you can see, the y disappeared, which was the objective of this operation.
Now the equations can be solved easily:
7x = 21
x = 3
Insert x=3 in the original equation:
3*3 - y = 8
9 - y = 8
9 = 8 + y
y = 1
So the result is:
x = 3
y = 1
Ответ:
Ответ:
B)
Step-by-step explanation:
to find the volume we need to find first the area of the triangle, and then multiply by 11 which is the length of the prism:
the measurements are:
the area of the triangle in one side is:
and now to find the volume of the prism we multiply the area of the triangle by the length of the prism:
which is option B)