Question

17/20 which equation will help you solve for x? 2x + x + 9 = 180 2x = x + 9 2x + x + 9 = 90

Explanation:

Step1: Identify angle - relationship

The two angles \(2x^{\circ}\) and \((x + 9)^{\circ}\) are complementary (since they form a right - angle). Complementary angles sum to \(90^{\circ}\).

Step2: Write the equation

Based on the sum of complementary angles, the equation is \(2x+(x + 9)=90\).

Answer:

\(2x + x+9 = 90\)