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3 years ago

The graph shows two lines, A and B.

Mathematics

2 answers:

Delvig [45]3 years ago

7 0

<h2>Answer:</h2>

The correct answer is: Last option.

(2, 1) is the solution to both lines A and B.

<h2>Step-by-step explanation:</h2>

We know that the solution of a system of equation is the set of points where the system of equation meet.

from the graph that is provided to us wee see that the graph consist of two lines A and B such that the two lines intersect at point (2,1).

This means that the solution to the system of equations for lines A and B is:

(2,1)

joja [24]3 years ago

6 0

The answer is D, <span>(2, 1) is the solution to both lines A and B. I hope this helps :)</span>

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A professor has recorded exam grades for 10 students in his class, but one of the grades is no longer readable. If the mean sco

Nostrana [21]

Answer:

unreadable score = 35

Step-by-step explanation:

We are trying to find the score of one exam that is no longer readable, let's give that score the name "x". we can also give the addition of the rest of 9 readable s scores the letter "R".

There are two things we know, and for which we are going to create equations containing the unknowns "x", and "R":

1) The mean score of ALL exams (including the unreadable one) is 80

so the equation to represent this statement is:

mean of ALL exams = 80

By writing the mean of ALL scores (as the total of all scores added including "x") we can re-write the equation as:

$\frac{R+x}{10} =80$

since the mean is the addition of all values divided the total number of exams.

in a similar way we can write what the mean of just the readable exams is:

$\frac{R}{9} = 85\\$ (notice that this time we don't include the grade x in the addition, and we divide by 9 instead of 10 because only 9 exams are being considered for this mean.

Based on the equation above, we can find what "R" is by multiplying both sides by 9:

$\frac{R}{9} = 85\\R=85*9= 765$

Therefore we can now use this value of R in the very first equation we created, and solve for "x":

$\frac{R+x}{10} =80\\\frac{765+x}{10} =80\\765+x=80*10=800\\765+x=800\\x=800-765=35$

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3 years ago

How to solve - 10+5x=7x-4

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3. divide 14 to both sides
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