3 years ago

Line EF has an equation of a line y = -2x + 7, and line GH has an equation of a line y = x -1. These two lines are

Mathematics

1 answer:

Dmitry_Shevchenko [17]3 years ago

7 0

Intersecting but not at a right angle

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3x - 3y = 9 and x + 3y = 12 <br> Elimination

Firlakuza [10]

Answer:

$x=5.25,y=2.25$

Step-by-step explanation:

We can add the two equations to eliminate the variable $y$ and solve for $x$ :

$3x-3y+x+3y=9+12$

$4x=21$

$x=5.25$

Now, we can use substitution to solve for $y$ :

$x+3y=12$ (given)

$5.25+3y=12$

$3y=12-5.25$

$=6.75$

$y=2.25$

Hope this helps :)

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3 years ago

Give an estimate of the mean hardness that you would expect after 37 and 41 hours; and a 85% confidence interval for each estima

Jlenok [28]

The predicted value of hardness at 37 hours is 243.87 and an 85% confidence interval for the mean hardness is (242.12, 245.61). At 41 hours, the predicted hardness is 252 and an 85% confidence interval for mean hardness is (249.83, 254.18). The confidence interval for X is equals to 41 which is wider because the value 41 is farther away from the sample mean X than is 37. As an outcome, the standard error for the prediction is larger.

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3 years ago

One-fourth of a number and 6 is the same as 3 subtracted from the number itself

ratelena [41]

Answer:

I'm not the greatest at math but I'll see if I can get this right.

I'm super sorry if this is wrong