Solve for Angles Algebra

Tell whether the angles are complementary or supplementary. Then find the value of x.

• Complementary; x=3.4

• Complementary; x=45

• Supplementary; x=20

• Supplementary; x=175

Solve for x

• 6

• 140

• 20

• 90

Find x, then find the measurement of both angles.

• x = 30; both angles measure 118 degrees

• x = 30; both angles measure 114 degrees

• x = 20; both angles measure 112 degrees

• x = 20; both angles measure 110 degrees

Find the value of x.

• 20

• 135

• 31

• 145

• 70

• 110

• 7

• 10.1

Answer explanation

Did you just find x, or did you plug it back in for the angle?

• 80

• 40

• 30

• 20

• 10

Find the value of x

Mathematical Equivalence

ON

x = ?

• 5

• 15

• 12

• 10

Answer explanation

Start by solving for x.

Since all three angles lie on a straight line, the three angles must add up to 180.

We can then write the following equation to solve for x.

6x−10+4x+6+7x+14=180

Combine Like Terms

17x+10=180

17x=180-10

17x=170

x=170/17

x=10

Mathematical Equivalence

ON

Figure 2.
If m∠RNP = (8x + 63)°
 and m∠NRS = 5x°, find m∠RNP

• 45

• 135

• 180

• 90