Question

Which of the following is a solution/are solutions of the system

4x + 2y − 3z = 0
7x − 3y + z = 4

A. (1, 2, 3)
B. (1, −2, 3)

1. Only A 2. Only B 3. Both A and B 4. Neither A nor B.

Answer 1

well, for both equations, plug in the given values for x,y and z and see if they work (equal RHS)

Answer 2

4 sum it and replace with A and B

Answer 3

if for instance A is true for the one equation and not for the other,does it make it a solution?

Answer 4

no it must be solution for both

Answer 5

ok so lemme know @Kudos what you tried?

Answer 6

i substituted the values of A into eqaution 1 (false) eqn 2 (true)

values of B into eqn 1(false) eqn 2 (false)

Answer 7

Thanxs guys, makes sense

Answer 8

so the answer must be : neither A or B

Answer 9

since it is necessary to have the values correct in both eqn..

Answer 10

@mathslover ,yes it is

Answer 11

nice then. .

so at last:
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