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Firdavs [7]
4 years ago
12

How do u slove systems by elemination -12x+6y=18 6x-7y=-5

Mathematics
2 answers:
hammer [34]4 years ago
8 0
-12x+6y=18 First line up the two equations
6x-7y=-5
-12x+6y=18
12x-14y=-10 Then find common factor and multiply one of the variables.
-8y=8Next eliminate the x and solve for y by dividing -8 on both sides getting
y=-1
Lastly plug in y into one of the original equations and solve for x
Check your answer by plugging into the original equation

vitfil [10]4 years ago
6 0
You need to add one equation to the other. To do this, multiply the divide the entire equation by 2. The resulting equation gives: -6x + 3y = 9
Now, add this to the second. Doing this will cancel out the 6xs because they are opposite signs.
-4y = 4 is your simplified equation. 
Solve for y: y = -1
Plug this into an original equation.
-12x + 6(-1) = 18
-12x -6 = 18
-12x = 24
x = -2
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mixas84 [53]
Yes it is proportional for a table
8 0
2 years ago
For a 2 week period Jan earned $150 less than twice toms earnings together Jen and tom earned 1380$ how much did tom earn?
nika2105 [10]
Given:
Tom's earnings: x
Jan's earnings: 2x - 150
Total earnings: 1380

x + 2x - 150 = 1380
3x = 1380 + 150
3x = 1530
3x/3 = 1530/3
x = 510

Tom's earnings: x = 510
Jan's earnings: 2x - 150 = 2(510) - 150 = 1,020 - 150 = 870
total earnings: 1,380

510 + 870 = 1,380
1,380 = 1,380
6 0
3 years ago
If x-5/4 = -9/5, then x =
Lerok [7]

Answer:

[See Below]

Step-by-step explanation:

✦ First change the improper fractions to decimals:

  ✧ ⁵⁄₄ = 1.25

  ✧ -⁹⁄₅ = -1.8

✦ Then divide:

  ✧ 1.25 ÷ -1.8 = -0.69

So x would be -0.69 in decimal form.

~<em>Hope this helps Mate. If you need anything feel free to message me.</em>

8 0
4 years ago
Le ways
SSSSS [86.1K]

<em>the answer 3.15</em>

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

<em>because 45x7=315</em>

<em>if I am wrong i am soury</em>

<em />

5 0
3 years ago
There were 56 females and 84 males present at the high school pep rally. Find the ratio of males to the total number of people p
irina [24]

Answer:

So first you would add the to numbers 56+84 to get 140. then you would put it in fraction form of males to total people (56/140). Then by simplifying you would get the answer of 2/5!

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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