3. 5x − 3y = 0 x=3 y=5
5. 3x + 4 y = 15
7 x − y = − 16
x=5 x=1
x = 0 y = 16 y = 0 x = − 2 27 Escala 1:2
3x +
0
4y =
15
(1,3)
7x y=
-16
5x
= y -3
2x + y = 5 x= 0 y=5 x= 2 y=1
y= 0 y=3
+ 2x y=
(-3,-5)
5
sol : x = - 3 4. 3x = − 4y 3x + 4y = 0 x=4 y=−3
3x +
sol :
5x − 6y = 38 x=−2 y=−8 y=−3 x=4
x=1
0
5x + 2y = 16
5x
4 x + 3 y = 10 x=−2 y=6 x=1 y=2
x=2 y=3 x=4 y= −2
(4,-3)
= y -6
y= 3
6. 5x + 2 y = 16
10 = 3y + 4x
4y =
y=-5
38
sol : x = 4
(4,-2)
y=-3
sol : x = 4
y=-2