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presleyann1902
23.12.2019 •
Mathematics
What is the solution to the system of equations?
use the linear combination method.
3x+y=3
2x+y=7
enter your answer in the boxes.
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Ответ:
(x, y) = (-4, 15)
Step-by-step explanation:
The two equations have the same coefficient for y, so you can eliminate y by subtracting one equation from the other. Here the x coefficient is largest for the first equation, so it will work best to subtract the second equation.
(3x +y) -(2x +y) = (3) -(7)
x = -4 . . . . . . . . simplify
Now, we can find y by substituting this value for x.
2(-4) +y = 7
y = 7 +8 = 15 . . . . . add 8 to both sides of the equation
The solution is (x, y) = (-4, 15).
Ответ:
a
Step-by-step explanation: