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The Brainliest Answer!
2014-10-15T20:32:23+08:00
the \ first \ number:\ \ x \\the \ second \ number: \ \ y\\\\\begin{cases}x+y=30 \\ x-y=50 \end{cases}\\------ \\2x=80 \ \ / :2\\x=40

 40+y=30  \\y=30-40\\y=-10 \\ \\ Answer: \\\ \ the \ first \ number:\ \ 40 \\the \ second \ number: \ \ (-10)\\ \\ check:\\40-10=30\\ \\30=30\\L=R\\\\40-(-10)=50\\40+10=50\\50=50\\L=R

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i believe that the statement is 'the difference of thrice the first number and the second number is 50' and it's some kind of clerical error.. then you'll have the second equation as 3x-y=50. making the value of x=20 and y=10
riza thank you for your answer it is exactly right