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Solve for x. Helpppp plisssssssssssss

Solve for x. Helpppp plisssssssssssss-example-1
User Muhammetkiran
by
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1 Answer

24 votes
24 votes

Answer:

10

Explanation:

128 is a supplementary angle. Supplementary angles always equal 180°.

Subtract 128 from 180

180 - 128

= 52

You now know one angle of the triangle (52). Let's find x now.

Triangles always equal 180°.

Set 4x + 3, 9x -5, and 52 equal to 180

4x + 3 + 9x -5 + 52 = 180

Combine like terms

4x + 3 + 9x -5 + 52 = 180

13x + 3 - 5 + 52 = 180

13x + 50 = 180

Subtract 50 to both sides

13x + 50 -50 = 180 -50

13x = 130

Divide by 13 to both sides

13x ÷13 = 130 ÷13

x = 10

Hope this helps and have a good rest of your day! :)

User GrayFace
by
2.9k points