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0,1x + 0,01 (x - 10) = 110,9-x 

1x + 1x - 10 = 1109 - 10x

2x - 10 = 1109 - 10x

2x = 1119 - 10x

12x = 1119

x = 1119/12 = 373/4

 

15x - (8-3x) = 24 + 2x 

15x - 8 + 3x = 24 + 2x

18x - 8 = 24 + 2x

18x = 32 + 2x

16x = 32

x = 2

 Nov 27, 2019
 #1
avatar+23575 
+2

Could anyone check if these are correct?

 

2. is correct !

 

1.

\(\begin{array}{|rcll|} \hline 0.1x + 0.01 (x - 10) &=& 110.9-x \quad | \quad \times 10 \\ 1x + 0.1 (x - 10) &=& 1109-10x \\ x + 0.1x - 1 &=& 1109-10x \\ 10x +x + 0.1x - 1 &=& 1109 \\ 10x +x + 0.1x &=& 1110 \\ 11.1x &=& 1110 \\ \\ x &=& \dfrac{1110}{11.1} \\ \\ \mathbf{x} &=& \mathbf{100} \\ \hline \end{array}\)

 

laugh

 Nov 27, 2019
 #2
avatar
+2

Ahh I see where I went wrong. Thank you so much!

Guest Nov 27, 2019

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