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1Angel2Got3Brains
03.11.2020 •
Mathematics
What is the results of these 2 equations?
-2x+7y=-5
-2x-4y=6
Solved
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Ответ:
y = 2/7x - 5/7
y = -1/2x - 2/3
Please mark me Brainliest; I need it to move onto the next level.
Ответ:
The solution is (-1,-1).
Step-by-step explanation:
-2x + 7y = -5
-2x -4y = 6
Solve using the elimination method. First multiply the top equation by -1 to develop a new equation to eliminate the x variable.
-1(-2x + 7y) = -1(-5)
New equation: 2x -7y= 5 Using this new equation, add it to the down equation to eliminate the x variable.
+ 2x - 7y = 5
-2x -4y = 6
-11y = 11 Divide both sides by -11.
y = -1
We will now input, the value of y into one of the equation to solve for x.
2x - 7(-1) = 5
2x + 7 = 5 Subtract 7 from both sides
-7 -7
2x = -2 Divide both sides by 2.
x = -1
Ответ:
It will be the first one, because opposite of 9 is negative 9.
It will be the second one because the negative is outside of the absolute value, still making it negative 9.
The fourth will be an answer also because the negative is outside of the absolute value, still making it negative 9.