Question

encontre o ponto de interseçao das retas r:3x-2y+5=0 e s:2x+2y+10=0

Answer 1

3x-2y=-5
2x+2y=-10
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5x = -15x = -15/5
x = -3
2x+2y = -10
2.(-3)+2y = -10
-6+2y = -10
2y = -10+6
2y = -4
y = -4/2
y = -2

P (-3; -2)

Answer 2

r: 3x-2y+5=0
s: 2x+2y+10=0

3x-2y = - 5 
2x+2y = - 10
5x = - 15 ==> x = - 3

2x + 2y = - 10 ==> 2y = - 10 - 2x ==> 2y= -10-2(-3)=>

2y= -10+6 ==> 2y = - 4 ==> y = - 2