Question

Selesaikan dengan cara substitusi
1. 2x + y = 3
x + 5y = 6
2. x + 3y = -2
x - 3y = 16
3. x + y = 3
x - y = 1
4. x + y = 1
5x + 3y = -3

Mohon di jawab segera

Answer 1

2x + y = 3 [*5]
x+5y =6
= 10x + 5y = 15 - x + 5y =6
= 9x = 9
x = 9/9 =1. x=1

maka
y = 2x + y = 3
= 2.1 + y = 3
y = 3-2 = 1 y = 1

X =1
Y = 1

SMOGA MEMBANTU

Answer 2

1. 2x+y=3 --> y=3-2x
x+5y=6
x+5(3-2x)=6
x+15-10x=6
9x=9
x=1 ..............
y=3-2x
y=3-2(1)
y=1 ...........

2. x+3y=-2
    x=-2-3y
x-3y=16
-2-3y-3y=16
-6y=18
y=-3 ..........
x=-2-3y
x=-2-3(-3)
x=-2+9
x=7 ..........

3. x+y=3
y=3-x
x-y=1
x-(3-x)=1
x-3+x=1
2x=4
x=2 ...........
y=3-x
y=3-2
y=1 ............

4. x+y=1
y=1-x
5x+3y=-3
5x+3(1-x)=-3
5x+3-3x=-3
2x=-6
x=-3 ...........
y=1-x
y=1-(-3)
y=1+3
y=4 ...............