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For which equation(s) is — 2 a solution? O 2x + 6 = 2 2(x + 4) = 6x 3x + 5 = 5x + 6 [ 7 - 3r = 5x + 11 3a + 15 20 + 9

User Balour
by
2.6k points

1 Answer

28 votes
28 votes

Let's solve for x in each equation

2x + 6 = 2

2x = 2- 6

2x = -4

x= -2

2x + 6 = 2 has -2 as a solution

2(x- 4 ) = 6x

2x -8 = 6x

-8 = 4x - 2x

-8 = 2x

-8 = 2x

-4 = x

-2 is not the solution

3x + 1/2 = 1/4 x + 6

3x - 1/4 x = 6 - 1/2

11/4 x = 11 /2

11x /4 = 11/2

x = 11/2 (4/11)

x =2

-2 is not a solution

7 - 3x = 5x + 11

7 - 11 = 5x + 3x

-4 = 8x

x= -1/2

-2 is not a solution

3x + 15 = 2x + 9

3x - 2x = 9 - 15

x = -6

The only equation with a solution of -2 is;

2x + 6 = 2

User Hcp
by
2.3k points
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