SOLUTION: I am working on solving systems by substitution and elimination. An example problem is {-7x-y=-31 nxt line -7x=23 I have x=-23/7 y=-7(-23/7)+31=54. my question is how do I get the

Algebra ->  Test -> SOLUTION: I am working on solving systems by substitution and elimination. An example problem is {-7x-y=-31 nxt line -7x=23 I have x=-23/7 y=-7(-23/7)+31=54. my question is how do I get the       Log On

Hi

-7x=23              |Yes, x = -23/7

-7x-y=-31 

-7*-23/7 - y = -31  |substituting for x

  23 - y = -31      |solving for y   Note: 

    54 = y