How do you solve #3x + y = 3#, #x - 4y = 1#?
1 Answer
Mar 21, 2018
Explanation:
#3x+y=3to(1)#
#x-4y=1to(2)#
#"from equation "(1)" we can express y in terms of x"#
#rArry=3-3xto(3)#
#color(blue)"Substitute "y=3-3x" into equation "(2)#
#x-4(3-3x)=1#
#rArrx-12+12x=1#
#rArr13x-12=1#
#"add 12 to both sides"#
#13xcancel(-12)cancel(+12)=1+12#
#rArr13x=13rArrx=1#
#"Substitute "x=1" into equation "(3)#
#rArry=3-3=0#
#"solution is "(x,y)to(1,0)#
