3x-4y=-6
2x+4y=16
2 (3x-4y= - 6)-------------6x-8y=-12
-3 (2x+4y=16)---------- -6x-12y=-48
------------------
-20y= -60
y=-60/-20
y=3
2x+4(3)=16
2x=16 - 12
x=2
R= x=2 y=3
3x+2y= 7
4x-3y= -2
3(3x+2y=7)-------------9x+6y=21
2(4x-3y=-2)-------------8x-6y=-4
-----------------
17x =17
x= 1
3(1)+2y=7
y=2
R=x=1 y=2
3x+2y=24
x+3y=3
3x+2y=24-----------3x+2y=24
-3(x+3y=3)------- -3x-9y= -9
----------------
-7y=15
y= - 15/7
x+3(-15/7)=3
x-45/7=3
7x-45=21
x=66/7
R=x=66/7 y= -15/7
x+y=3500
x-10x/100 + y-8y/100=3170
-90(x+y=3500)---------------> - 90x-90y=-315000
90x+92y=317000---------- 90x+92y=317000
-------------------------------
2y=2000
y= 1000
x+1000=3500
x=2500
R=x=2500 y=1000
2x+3y=-1
3x+4y=0
3x=-4y
x= -4y/3
2(-4y/3)+3y=-1
-8y/3 + 3y=-1
-8y+9y=-3
y=-3
x=-4(-3)/3
x=4
R=x=4 y=-3
