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Use of Substitution to Solve the Systems of Equations

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1 Answer

Hi Conny;
6x-y=22
y=-8
(6x)-(-8)=22
Subtracting a negative number is the same as adding a positive number...
6x+8=22
Let's subtract 8 from both sides...
-8+6x+8=22-8
6x=14
Let's divide both numbers by 6..
(6x)/6=14/6
x=14/6
x=7/3
Let's check our work...
6x-y=22
[(6)(7/3)]-(-8)=22
(42/3)+(8)=22
14+8=22
22=22
 

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