Question

Resolva os seguintes sistemas:
a)2x+y-6=0
4x-3y+8=0


b)1/2x-3y=-1
x+2=6y


c)6x+2y+1=0
x+y/3=23/6

Answer 1

a) 2x + y - 6 = 0
4x - 3y + 8 = 0

2x = 6 - y
x = 3 - y/2

4(3 - y/2) - 3y + 8 = 0
12 - 2y - 3y + 8 = 0
-5y = -12 - 8 (-1)
y = 4

x = 3 - 4/2
x = 1

Answer 2

a) 2x+y-6=0 .(-2)                      
    4x-3y+8=0

-4x-2y+12=0        4x-3y+8=0         
4x-3y+8=0            4x-3*4+8=0
                            4x-12+8=0
-5y+20=0                4x=4
-5y=-20                   x=4/4=1
y=20/5
y=4