SOLUTION: solve by substitution 4x+3y=4 y=2x-7

Algebra ->  College  -> Linear Algebra -> SOLUTION: solve by substitution 4x+3y=4 y=2x-7      Log On


   

Question 547793: solve by substitution
4x+3y=4
y=2x-7
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
4x+3y=4


4x+3(2x-7)=4


4x+6x-21=4


10x-21=4


10x=4+21


10x=25


x=25/10


x=5/2
-------------------------------------------------------

y=2x-7


y=2(5/2)-7


y=5-7


y=-2


So the solutions are x = 5/2 and y = -2