Answer:
x=2, z=4, y=-6
Step-by-step explanation:
Add
<u>-9x-y+2z= -4</u>
<u>-6x+y+5z= 2</u>
-9x-6x is -15x
-y+y is 0
2z+5z is 7z
-4+2 is -2
So the equation now looks like this: -15x+7z=-2
Subtract
<u>-6x+y+5z= 2</u>
<u>-4x+y+5z= 6</u>
So the equation will look like this:
<u>-6x+y+5z= 2</u>
<u>-(-4x+y+5z= 6)</u>
-6x+4x is -2x
y-y is 0
5z-5z is 0
2-6 is -4
So the equation now looks like this: <u>-2x=-4</u>
You can find x by dividing -2 on both sides:
<u>x=2 </u>
So 2 is x
Now you can substitute x into 2
-15(2)+7z=-2
-30+7z=-2
7z=28
Divide 7 on both sides:
<u>z=4</u>
So now you can substitute z into 4 (For any of the three equation)
-4(2)+y+5(4)=6
-8+y+20=6
20 minus 8 is 12
y+12=6
Subtract 12 on both sides:
y=-6
So the answers are
x=2, z=4, y=-6
Hope this helps!
Answer:
9
Step-by-step explanation:
Answer:
Step 2: Commutative Property
Step 3: Associative Property
Step-by-step explanation:
According to the Commutative Property of Addition: Two real numbers can be added in either order.
a + b = b + a
Therefore, she used the Commutative Property in Step 2.
In Step 3, she used the Associative Property, in which the grouping of the addends does not change the sum.
Answer:
9
Step-by-step explanation:
A composite number is a positive integer. which is not prime. The first few composite numbers (sometimes called "composites" for short) are 4, 6, 8, 9, 10, 12, 14, 15, 16, ...
Answer:
5.35
Step-by-step explanation:
