Question

Resolva os sistemas a seguir:

a) 4(x+1)=2y+5
x+y=4

b) 3x+2=y+3
x+y=4

c) x/2+y=7
3x+y=x+13

Answer 1

a )4x+4=2y+5
x+y=4
x=-y+4
4 (-y+4)+4=2y+5
-4y+36+4=2y+5
-4y-2y=5-36-4
-2y=45×(-1)
2y=-45
y=-45÷2
y=22, 5

x+22, 5=4
x=-22, 5+4
x =-18, 5

acho que essa tá certa