Question

please answer question no. 13 and 15 , i will mark as brainlist​

Answer 1

hey mate!

13) 3x + 2(x + 2) = 20 - (2x -5)

= 3x + 2(x + 2) = 20 - (2x - 5)

= 3x + 2x + 4 = 20 - 2x + 5

= 5x + 4 = 20 - 2x + 5

So, 5x + 2x = 20 + 5 - 4

therefore, 7x = 21

so, x = 21 ÷ 7 = 3

15) ( 2z - 7) - 3 ( 3z + 8 ) = 4z - 9

= 2z - 7 - 9z - 24 = 4z - 9

= 2z - 4z - 9z = -9 +7 + 24

= - 11z = 22

so, z = -22/ 11 = -2

hope this helps you!

pls mark it as brain list

thanks❤❤

Answer 2

Given,

$13. \: \: \:3x + 2(x + 2) = 20 - (2x - 5)$

$14. \: \: \:(2z - 7) - 3(3z + 8) = 4z - 9$

To Find,

• Value of X
• Value of Z

Solution,

$13. \: \: \: 3x + 2(x + 2) = 20 - (2x - 5) \\ \\ : \implies 3x + 2x + 4 = 20 - 2x + 5 \\ \\ : \implies 5x + 4 = 25 - 2x \\ \\ : \implies 5x + 2x = 25 - 4 \\ \\ : \implies7x = 21 \\ \\ : \implies x = \frac{21}{7} \\ \\ : \implies \boxed{x = 3}$

$14. \: \: \: (2z - 7) - 3(3z + 8) = 4z - 9 \\ \\ : \implies2z - 7 - 9z - 24= 4z - 9 \\ \\ : \implies - 7z -31= 4z - 9 \\ \\ : \implies - 7z - 4z = 31 - 9 \\ \\ : \implies - 11z = 22 \\ \\ : \implies z = \frac{22}{ - 11} \\ \\ : \implies \boxed{z = - 2}$

Required Answer,

13. X = 3

14. Z = -2