IDNLearn.com: Where questions are met with accurate and insightful answers. Our community is here to provide the comprehensive and accurate answers you need to make informed decisions.

can some one help how to work out this problem
x-y=11
2x+y=19
solve by substitution 


Sagot :

[tex]x-y=11 \\ 2x+y=19 \\ \\ \hbox{solve the 1st equation for x:} \\ x-y=11 \\ x=11+y \\ \\ \hbox{substitute 11+y for x in the 2nd equation:} \\ 2(11+y)+y=19 \\ 22+2y+y=19 \\ 22+3y=19 \ \ \ |-22 \\ 3y=-3 \ \ \ |\div 3 \\ y=-1 \\ \\ x=11+y=11-1=10 \\ \\ (x,y)=(10,-1)[/tex]