Question

Suppose angle A and angle B are supplementary.

Answer 1

Answer:

x = 2

Angle A = 95°

Angle B = 85°

Step-by-step explanation:

Concepts

Supplementary angles are angles that sum up to 180° to form a straight angle.

Application

We are asked to find the value of x, Angle A, and Angle B. We are given angles A and B as 15x + 65 and 50x - 15. To do this, we can set up the equation 15x + 65 + 50x - 15 = 180 because we know these angles are supplementary, or adding to 180°. Then, once we get the value of x, we plug in that value for each angle.

Solution

Step 1: Simplify both sides.

• $(15x+50x) +(65-15)=180$
• $65x+50=180$

Step 2: Subtract 50 from both sides.

• $65x+50-50=180-50$
• $65x=130$

Step 3: Divide both sides by 65.

• $65x/65 = 130/65$
• $x=2$

Step 4: Plug x into angle A.

• $15(2)+65 = 30 + 65 = 95$

Step 5: Plug x into angle B.

• $50(2) - 15 = 100 - 15 = 85$