Question 922079
-4(2x + y -z =-9)
<u>7x + 4y + z = 7 </u>
{{{-x + 5z = 43}}}
.........

-2(2x + y - z = -9)**
<u>3x + 2y + 3z = 25</u>
{{{-x + 5z = 43}}} **
........
-(-x + 5z = 43)
<u>-x + 5z = 43</u>
 0 = 0  Dependent System, INfinite Solutions
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Let z = c , {{{x = 5c-43}}}  and {{{y = -2(5c-43) + c - 9}}}, {{{y = -9c + 77}}} 
(5c - 43, -9c +77, c) are the solutions in terms of c