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Verizon [17]
3 years ago
5

U-v=0 7u+v=0 solve by substitution

Mathematics
2 answers:
VLD [36.1K]3 years ago
3 0
Adding v to both sides of the first equation, we have that u=v.  Substituting this into the second equation, we have that 8u=0, and thus that u=0.  Since u=v, we have v=0, so our solution is u=0, v=0.
irga5000 [103]3 years ago
3 0
U=0
V=0

If u-v=0, they must be both the same number. Therefore, u=v. 7u+v=0. 7u is 7*u but we must get the answer reduced to 0 so u=0. We already know from the first sentence that u=v. In conclusion, both variables are equivalent to 0.


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iragen [17]

Answer:

We conclude that Jamal will rewired 20 electrical outlets for 7.5 hours.

Step-by-step explanation:

We know that Jamal  rewired 4 electrical outlets in 1 and one-half hours. We calculate how many electrical outlets will he rewired for 7.5 hours.

We have the following proportion:

4:1.5=x:7.5\\\\1.5x=4\cdot 7.5\\\\1.5x=30\\\\x=\frac{30}{1.5}\\\\x=20

We conclude that Jamal will rewired 20 electrical outlets for 7.5 hours.

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Step-by-step explanation:

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Step-by-step explanation:

1. 1/4(x + 12)=2 - first isolate X'

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Andre did the first step correctly, but on the second step he just divided 1.4 by -10, instead of subtract 1/4 from both sides.

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