find the value of x. x = ?° 51° (3x)°

Explanation:

Step1: Identify supplementary angles

The angle of (51^\circ) and the angle of ((3x)^\circ) are supplementary (they form a linear pair), so their sum is (180^\circ). [51 + 3x = 180]

Step2: Solve for (x)

Subtract (51) from both sides: [3x = 180 - 51] [3x = 129] Divide both sides by (3): [x = \frac{129}{3}] [x = 43]

Answer:

(43)