Answer:
Yes, it is harder.
Step-by-step explanation:
Answer: 1 is -17, 2 is -2, 3 is -2.5, 4 is 3, 5 is -3, 6 is -4, 7 is 2.5, 8 is -1, 9 is 4, and 10 is 2.
Step-by-step explanation:
I'd suggest using "elimination by addition and subtraction" here, altho' there are other approaches (such as matrices, substitution, etc.).
Note that if you add the 3rd equation to the second, the x terms cancel out, and you are left with the system
- y + 3z = -2
y + z = -2
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4z = -4, so z = -1.
Next, multiply the 3rd equation by 2: You'll get -2x + 2y + 2z = -2.
Add this result to the first equation. The 2x terms will cancel, leaving you with the system
2y + 2z = -2
y + z = 4
This would be a good time to subst. -1 for z. We then get:
-2y - 2 = -2. Then y must be 0. y = 0.
Now subst. -1 for z and 0 for y in any of the original equations.
For example, x - (-1) + 3(0) = -2, so x + 1 = -2, or x = -3.
Then a tentative solution is (-3, -1, 0).
It's very important that you ensure that this satisfies all 3 of the originale quations.
Answer:
12
Step-by-step explanation:
you would put the 7 in the x spot then add 1 which makes it 8 then 8 x 2 = 16 - 4 equal 12 hope this helps