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Dafna1 [17]
2 years ago
5

*20 points* (9th grade) Value of x please

Mathematics
2 answers:
Roman55 [17]2 years ago
6 0
X=20

First observe the triangle, look at how the two sides are congruent. With that you can realize that the bottom right angle (3x+7) is congruent I the bottom left, meaning the bottom left angle is also 3x+7.

Next you would want to add 5x+13 to 3x+7 which will equal 180 because the two angles are on the same line and a line is 180 degrees. The equation would look like this after adding all like terms together: 8x+20=180. Next subtract 20 from both sides which will then look like 8x=160. Next isolate x by dividing by 8 on both sides to get x=20
Delicious77 [7]2 years ago
3 0
Answer: x is 20

Because both angles together make up 180° you can simply rearrange the equation to get 8x+20=180 and by solving you can come to the conclusion x=20
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