Question 12852
m-2n=16
--> m = 16+2n --eqn1


also 4m+n = 1. Now sub eqn1 into this one, to give


4(16+2n) + n = 1
64 + 8n + n = 1
64 + 9n = 1
9n = -63
n = -63/9
n = -7


hence, from eqn1:
m = 16 + 2(-7) --> this will be your error, here. You will have +14.
m = 16 - 14
m = 2


CHECK:
4m+n
4(2) + (-7)
8 - 7
1
which is correct.


Sharmaine - your working was fine apart from a simple error. You understand the process, so when your check showed you had an error, you go back and you double check EVERYTHING, especially minus signs, as that is usually where students make mistakes.


jon.