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Ray Of Light [21]
3 years ago
13

To solve this system of equations by elimination, what operation could be used to eliminate the x-variable and find the value of

y? 2x − 4y = 6 −3x + 3y = 9 a) add 2 times the second equation to 3 times the first equation b) add 3 times the second equation to 2 times the first equation c) subtract 2 times the second equation from 3 times the first equation d) subtract 3 times the second equation from 2 times the first equation
Mathematics
2 answers:
gayaneshka [121]3 years ago
6 0
The system of equations are:

2x − 4y = 6
−3x + 3y = 9

To eliminate x, you should:
1. multiply first equation with 3
2. multiply second equation with 2
3. add the new equations you got

So your answer is A.
GuDViN [60]3 years ago
5 0

Answer:

A)  add 2 times the second equation to 3 times the first equation

Step-by-step explanation:

add 2 times the second equation to 3 times the first equation

3(2x − 4y = 6)

2(−3x + 3y = 12)

6x − 12y = 18

−6x + 6y = 24

Adding the second equation to the first equation gives:

−6y = 42

y =  

42

−6

y = −7

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AURORKA [14]
The answer is 24 
subtract 156 from 180
108-156=24
5 0
3 years ago
Read 2 more answers
The length of the longer leg of a right triangle is 6 inches more than twice the length of the shorter leg. The length of the hy
Studentka2010 [4]

9514 1404 393

Answer:

  15 in, 36 in, 39 in

Step-by-step explanation:

The Pythagorean theorem tells us that for short side x, the relation is ...

  (2x +9)² = (2x +6)² +x²

  4x² +36x +81 = 4x² +24x +36 +x²

  x² -12x -45 = 0 . . . . . subtract the left-side expression

  (x -15)(x +3) = 0 . . . . factor

  x = 15 . . . . . . . . . . . the positive value of x that makes a factor zero

The side lengths of the triangle are 15 inches, 36 inches, and 39 inches.

6 0
3 years ago
Can anyone please help me
STatiana [176]

Answer:

42°

Step-by-step explanation:

Sum of all the angles inside of any triangle is always 180°.

Therefore:

180 = y + 90 + 48

y = 180 - 90 - 48

y = 42°

5 0
3 years ago
If h(x) = 2x - 1 and g(x) = 3x + 1, what is (h o g)(2)?
alukav5142 [94]

Answer:

Step-by-step explanation:

g(2) = 3(2) + 1 = 6 + 1 = 7

h(7) = 2(7) - 1 = 14 - 1 = 13

4 0
3 years ago
3)June 2019-In the diagram below of AABC, D is a
Alexeev081 [22]

Answer:

BC = 23.8

Step-by-step explanation:

See the diagram attached.

Given AC ║ DE and BD = 5, DA = 12 and BE = 7.

We have to find BC.

Since, AC ║ DE, so, Δ ABC and Δ DBE are similar.

If two triangles are similar then the ratio of their corresponding sides remains the same.

Hence, \frac{BD}{BA} = \frac{BE}{BC}

⇒ \frac{5}{12 + 5} = \frac{7}{BC}

⇒ BC = \frac{7 \times 17}{5} = 23.8 (Answer)

7 0
3 years ago
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