Answer:

Step-by-step explanation:
The given polynomials are,

In polynomial addition and subtraction only like terms can be added or subtracted.
So,




<span>System 1 and system 2, because the second equation in system 2 is obtained by adding the first equation in system 1 to two times the second equation in system 1
This is the correct answer because not only is it true but it also follows the property of solving systems of equations with adding the equations. To prove that it is true:
2nd equation in system #2 = 1st equation in system #1 + 2(2nd equation in system #1)
</span>10x − 7y = 18 == 4x − 5y = 2 + 2(<span>3x − y = 8)
10x - 7y = 18 == 4x - 5y = 2 + 6x - 2y = 16
10x = 7y = 18 == 10x - 7y = 18</span>
Answer: -13 °C.
Step-by-step explanation:
Answer:
12 times 2 since it doubles every time I'm not that sure so if I am not correct my bads