System problem

Question

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305

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Suppose a, b, c, and d are real numbers which satisfy the system of equations

a + 2b + 3c + 4d = 10

4a + b + 2c + 3d = 4

3a + 4b + c + 2d = -10

2a + 3b + 4c + d = −4.

Find a + b + c + d.

Guest Feb 13, 2022

ElectricPavlov · Answer 1 · 2022-02-13T09:48:56

Hint: Add all of the equations together....then divide by 10....

Guest · Answer 2 · 2022-02-14T10:36:14

I think this question has already been posted on this website.

Anyways, just like EP said, adding them should get your answer