SOLUTION: What is 3x + Y=5 Y=x-7? And how do you work it out

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: What is 3x + Y=5 Y=x-7? And how do you work it out      Log On

Ad: You enter your algebra equation or inequality - Algebrator solves it step-by-step while providing clear explanations. Free on-line demo .
Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!
Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

   

Question 565207: What is 3x + Y=5
Y=x-7? And how do you work it out
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
substituting the value of Y from the 2nd eqn into the 1st eqn ___ 3x + (x - 7) = 5 ___ 4x = 12

solve for x, and then substitute back to find Y