Solve the following system of equations?

Question

1. x - y = 5

2. y= -2x + 4

i get that i have to sub 2. in 1 like this:

x - -2x + 4 = 5 but then help me solve it....from here SHOW steps

Answer 1

x-(-2x+4)=5
x+2x-4=5
3x=9
x= 3

3-y=5
-y= 2
y= -2

Answer 2

Take the second equation and substitute it into the first equation:
x-(-2x+4)=5
x+2x-4=5
3x-4=5
3x=9
x=3

y=-2(3)+4
y=-6+4
y=-2

The solution set is (3,-2)

Check:
3-(-2)=5
3+2=5
5=5

-2=-2(3)+4
-2=-6+4
-2=-2

Answer 3

1. x-y=5
2. y=-2x+4
using subtitution
x-(-2x +4)=5
x+2x-4=5
3x=5+4
3x=9
x=3
plug x=3 into any equation,
equation 1
3-y=5
-y=2
hence, y= -2
if you pick equation 2
plug in x=3
y= -2(3)+4
y=-6+4
y= -2
x=3;y= -2
solved

Answer 4

x-y=5
x-(-2x+4)=5
x+2x-4=5
3x=9
x=3

x-y=5
3-y=5
-y=5-3
-y=2
y=-2

Answer 5

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