Question

Solve for x. please and thanks

Answer 1

x=9

Explanation:

A triangle is equaled to 180

13x+2+3x-4+5x-7=180

Combine like terms

21x-9=180

Add 9 to both side

21x=189

Divide 21 on both sides

x=9

CHECK:

13x+2

Substitute x with 9

13*9+2=119

3x-4

Substitute x with 9

3*9-4= 23

5x-7

Substitute x with 9

5*9-7=38

119+23+38=180

Answer 2

x = 9

Explanation:

• the sum of the interior angles in a triangle is 180°
• therefore

13x + 2 + 5x -7 + 3x - 4 = 180°

21x -9 = 180°

21 x = 180 + 9

21 x = 189

x = 189 : 21

x = 9

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check

13 * 9 + 2 + 5 * 9 - 7 + 3 * 9 - 4 = 180 (remember pemdas)

180 = 180

the answer is good