Question

sistema linear ?

4x + 3y= 5
x + y = 0
x + by = B

Answer 1

4x+3y=5
x+y=0------> x=-y

4*(-y)+3y=5
-4y+3y=5
-y=5
y=-5

x+y=0
x+(-5)=0
x-5=0
x=5

x+by=B
5+(-5b)=B
5-5b=B
-5b-b=-5
-6b= -5
b= -5/-6
b= 5/6