la69nita78 la69nita78

09-11-2021
Mathematics

contestada

What is the solution to the system of equations?
3x +y = 4
2x + y = 5
(-3, 13)
o(-1,7)
(0, 4)
(-3, 12)

Respuesta :

reinhard10158 reinhard10158

10-11-2021

Answer:

(-1, 7)

Step-by-step explanation:

we use a simple trick and subtract the whole second equation from the first

3x + y = 4

- 2x + y = 5

------------------

x + 0 = -1

x = -1

2x + y = 5

so,

2×-1 + y = 5

-2 + y = 5

y = 7

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