Algebra-1

To determine which equation has the solution x = 6 we need to substitute x = 6 into each equation and see if it holds true.

Option A: 0.85x = 5

0.85 × 6 = 5.1 ≠ 5

This equation does not hold true.

Option B: 0.7x = 4.2

0.7 × 6 = 4.2

This equation holds true.