Question

C)2x+3y=0
6x-4y=13
B)x+5y=1
3x-y=-13

Answer 1

Sistema?
C) 6x = 13 + 4y
x = 13 + 4y / 6
----
2x + 3y = 0
2(13+4y/6) + 3y = 0
13+4y/3 + 3y/1 = 0
13+4y+9y/3 = 0
13 + 13y = 0
13y = -13
y= -1
----
2x+3y=0
2x+3(-1)=0
2x-3=0
2x=3
x=1,5

B) x=1-5y
---
3x - y = 13
3(1-5y) - y = 13
3 - 15y - y = 13
-16y = 10
y = -0,625
----
x = 1 - 5(-0,625)
x = 1 + 3,125
x = 4,125