sir i can't understand this sum
        solve 20x+10y=3230 &15x+15y=3045 by substitution

Asked by seeni2005 | 22nd Jul, 2016, 08:14: PM

Expert Answer:

begin mathsize 16px style 20 straight x plus 10 straight y equals 3230 space and space 15 straight x plus 15 straight y equals 3045
On space reducing comma space we space get comma space 2 straight x plus straight y equals 323 space and space straight x plus straight y equals 203
Substitute space straight y space equals 203 minus straight x space in space the space equation comma space 2 straight x plus straight y equals 323
rightwards double arrow 2 straight x plus left parenthesis 203 minus straight x right parenthesis equals 323
rightwards double arrow straight x plus 203 equals 323
rightwards double arrow straight x space equals 120
Substitute space straight x equals 120 space in space straight x plus straight y equals 203
rightwards double arrow 120 plus straight y equals 203
rightwards double arrow straight y equals 83
Hence comma space straight x equals 120 space and space straight y equals 83. end style

Answered by Rebecca Fernandes | 24th Jul, 2016, 12:01: PM