She can use 2x5 because that is the commutative property. commutative property of multiplication states that two numbers can be multiplied in either order, for example, 3x15 can also be multiplied in this way: 15x3. they will both make the same answer: 45
The answer to the system of equations is x = 3, y = -2 and z = 5.
In order to find this you can use elimination to create two equations with only x and y. First we will add equation one with equation 2 multiplied by 2.
-x + 2y + 2z = 3
6x + 2y - 2z = 4
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5x + 4y = 7
Then we can add equation 2 with equation 3.
3x + y - z = 2
2x + y + z = 9
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5x + 2y = 11
Now we can use these two equations together to solve for y. It will be easiest if we multiply the second one by -1.
5x + 4y = 7
-5x - 2y = -11
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2y = -4
And then we can solve for y.
2y = -4
y = -2
With that answer we can go back to any equation with just y and x and solve for x.
5x + 4y = 7
5x + 4(-2) = 7
5x - 8 = 7
5x = 15
x = 3
Now we can use x and y in any equation to find z.
2x + y + z = 9
2(3) + (-2) + z = 9
6 - 2 + z = 9
4 + z = 9
z = 5
A, using the formula length= Area: width
and we have the length= 3535:2525= 1,4 m or this number as a fraction 14/10=7/5
But the length is smaller than the width?
b, I think you type wrongly the problem
Answer is A and C because they equal to 3(10-c)
Answer:
<em><u>Answer is below</u></em>
Step-by-step explanation:
<u><em>2x+5y=3y+8</em></u>
<u><em>Add -3y to both sides</em></u>
<u><em>2x+5y+−3y=3y+8+−3y</em></u>
<u><em>2x+2y=8</em></u>
<u><em>Add -2x to both sides.</em></u>
<u><em>2x+2y+−2x=8+−2x</em></u>
<u><em>2y=−2x+8</em></u>
<u><em>Divide both sides by 2.</em></u>
<u><em>2y/2=-2x+8/2</em></u>
<u><em>y=−x+4</em></u>
