Respuesta :

maryanne50
7x-1+7x+8+5x+2=180
7x+7x+5x+2-1+8=180
19x+9=180
19x=180-9
19x=171
19x\19=171\19
x=9
therefore,7x-1
7(9)-1
=62
therefore, 7x+8
7(9)+8
=71
therefore 5x+2
5(9) +2
=47
sodiqolamilekan69

Answer:7x-1=62º

7x+8=71º

5x+2=47º

Step-by-step explanation:

Total angles in a triangle equals 180º

we can equate

7x+8+7x-1+5x+2=180

collecting like terms

7x+7x+5x=180-8+1-2

19x=171

divide both side by 19

x=9

for each angles we'll sustitute x

7x+8

7(9)+8

63+8

71º

7x-1

7(9)-1

63-1

62º

5x+2

5(9)+2

45+2

47º

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