document.write( "Question 982307: PLEASE HELP! I have no idea how to solve for x in matrices \r
\n" ); document.write( "\n" ); document.write( "[-14 -19 18]-([-4 1x 0] -[16 12 -8])=[6 5 10]\r
\n" ); document.write( "\n" ); document.write( "A.x = -7
\n" ); document.write( "B.x = 6
\n" ); document.write( "C.x = 4
\n" ); document.write( "D.x = -2
\n" ); document.write( "E. x = -4
\n" ); document.write( "F. x = -3
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #603150 by KMST(5328) $\"\"$ $\"About$

You can put this solution on YOUR website!
Adding matrices is just like adding numbers.
\n" ); document.write( "Your matrices have 1 row with 3 elements (numbers) on each row.
\n" ); document.write( "You work with the first number on the matrices to the left of the equal sign
\n" ); document.write( "to get the first number in the result matrix to the right of the equal sign,
\n" ); document.write( "-14-(-4-16) = -14-(-20) = -14+20 = 6 ,
\n" ); document.write( "but that was already done for you.
\n" ); document.write( "You would work with the last(third) number on the matrices to the left of the equal sign
\n" ); document.write( "to get the last number in the result matrix to the right of the equal sign,
\n" ); document.write( "18-(0-8) = 18-(0-(-8)) = 18-8 = 10 ,
\n" ); document.write( "but that was already done for you.
\n" ); document.write( "The same calculation with the middle number is
\n" ); document.write( " $\"-19-%281x-12%29+=+5\"$
\n" ); document.write( "We can try to solve that for $\"1x\"$ ,
\n" ); document.write( "and then figure out what was meant by $\"1x\"$ .
\n" ); document.write( "Normally you would say that $\"1x\"$ means $\"1\"$ times $\"x\"$ ,
\n" ); document.write( "and you would write it as just $\"x\"$ .
\n" ); document.write( "Another interpretation is that what was meant by $\"1x\"$ was
\n" ); document.write( "a two digit number with $\"1\"$ as the tens digit and $\"x\"$ as the units digit.
\n" ); document.write( " $\"-19-%281x-12%29+=+5\"$
\n" ); document.write( " $\"-%281x-12%29+=+5%2B19\"$
\n" ); document.write( " $\"-1x%2B12+=+24\"$
\n" ); document.write( " $\"-1x+=+24-12\"$
\n" ); document.write( " $\"-1x+=+12\"$
\n" ); document.write( " $\"1x=-12\"$
\n" ); document.write( "Normally you would say that $\"1x\"$ means $\"1\"$ times $\"x\"$ ,
\n" ); document.write( "and you would write it as just $\"x\"$ .
\n" ); document.write( "Another interpretation is that what was meant by $\"1x\"$ was
\n" ); document.write( "a two digit number with $\"1\"$ as the tens digit and $\"x\"$ as the units digit.
\n" ); document.write( "Neither interpretation works for any of the options given.
\n" ); document.write( "Maybe there was a typo in the problem as given to you. \n" ); document.write( "

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