Question 1156928
<pre>
SOLVE THE SYSTEM BY SUBSTITUTION

   A)3x+4y=11           B)3x+2y=6                                              
     -8-y=19              2x+5y=-7
</pre>


A:
Did you omit something?  As shown, you have {{{y=-8-19=-27}}}; substituting you make {{{3x+4*(-27)=11}}}
{{{3x=11+4*27}}}
{{{3x=119}}}
{{{x=39&2/3}}}
-
{{{x=39&2/3}}}and{{{y=-27}}}


B:
Why substitution?

{{{system(2(3x+2y)=2*6,3(2x+5y)=3(-7))}}}

{{{system(6x+4y=12,6x+15y=-21)}}}
and from this you could solve either for 6x and substitute into the other...