Elimination using addition and subtraction -3x - y = 24 ; 3x - 2y = 3

Mathematics

2 answers:

Usimov [2.4K]3 years ago

7 0

Answer:

(5,-9)

Step-by-step explanation:

-3x-y=24

3x-2y=3

eliminate the x values and then you have -3y=27

Then you get y=-9; you have to plug the y back in to an equation

-3x-2(-9)=3

-3x+18=3

-3x=-15

x=5

lozanna [386]3 years ago

5 0

Answer:

x=5

y=6

Step-by-step explanation:

this may be wrong

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A manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are more than 2 standard deviat

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bolts of length more than $13+0.2$ , and less than $13-0.2$ will be destroyed

= 13.20 cm and 12.80 cm

<u>Step-by-step explanation:</u>

Here we have , A manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are more than 2 standard deviations from the mean. The quality-control engineer knows that the bolts coming off the assembly line have mean length of 13 cm with a standard deviation of 0.10 cm. We need to find For what lengths will a bolt be destroyed .Let's find out:

A manufacturer of bolts has a quality control policy that requires it destroy any bolts that are more than 2 standard deviations from the mean.

mean length= $13 cm$