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14. Write a two-column proof.
Given: 8x=4y-20; y=13
Prove: x=4
Statements
Reasons
8x=4y-20; y=13
X=4

Sagot :

The final value of "x=4" and its calculation can be defined as follows:

Given:

[tex]\bold{ 8x=4y-20} \\\\ \bold{ y=13}[/tex]

Prove:

[tex]\bold{x=4}[/tex]

Solution:

[tex]\to \bold{8x=4y-20}..........(i)\\\\\to \bold{ y=13}........................(ii)[/tex]

Putting the value of equation (ii) into the equation (i):

[tex]\to \bold{8x=4(13)-20}\\\\\to \bold{8x=52-20}\\\\\to \bold{8x=32}\\\\\to \bold{x=\frac{32}{8}}\\\\\to \bold{x= 4}\\\\[/tex]

putting the value x into the equation (i):

[tex]\to \bold{8(4)=4y-20}\\\\\to \bold{32=4y-20}\\\\\to \bold{32+20=4y}\\\\\to \bold{52=4y}\\\\\to \bold{y=\frac{54}{4}}\\\\\to \bold{ y= 13.5}[/tex]

Therefore, the value of x= 4

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