Algebra-1

To determine which equation has the solution x = -1, we'll substitute x = -1 into each equation and see which one results in a true statement.

Option A: 1.2x + 2.1 = 2.7x − 1.8

1.2 × (-1) + 2.1 = 2.7 × (-1) − 1.8

-1.2 + 2.1 = -2.7 − 1.8

0.9 ≠ -4.5

This equation is not true when x = -1.

Option B: 3.4x − 1.7 = 2.5x + 2.3

3.4 × (-1) − 1.7 = 2.5 × (-1) + 2.3

-3.4 − 1.7 = -2.5 + 2.3

-5.1 ≠ -0.2

This equation is not true when x = -1.