x+y=1 2x-y=-2?

Question

use substutttuition method!

Answer 1

2x-y=-2
-y=-2x-2
y=2x+2

x+2x+2=1
3x+2=1
3x=-1
x=-1/3

-1/3+y=1
y=4/3

Answer 2

Rearranging the first equation we see that y = a million - x. replace this into the 2d equation: 2x - y = 2 2x - (a million - x) = 2 2x - a million + x = 2 3x - a million = 2 3x = 3 x = a million Now all of us comprehend what x is, we may be able to apply the first equation to make certain what y is: x + y = a million a million + y = a million y = 0 And so the answer is x = a million, y = 0

Answer 3

Given: x + y = 1 and 2x - y = -2
Find: x and y
Solution:
From, x + y = 1
The value of x = 1 - y
Substitute the value of x to the second equation, 2x - y = -2
2(1 - y) - y = -2
2 - 2y - y = -2
By transposition
-2y - y = -2 - 2
-3y = -4
y = 4/3

Substitute the value of y to x = 1 - y to get the value of x.
x = 1 - 4/3
x = -1/3

Answer 4

if x + y = 1, then x=1-y

subsititute that into 2x - y = -2, making it:
2(1-y) - y = -2
2 - 2y -y = -2
Subtract 2 from both sides:
2 - 2 - 1y = -2 - 2
-3y = -4
Divide both sides by -3
y = 4/3

Plug y = 4/3 into x + y = 1
x + 4/3 = 1
Subtract 4/3 from both sides
x + 4/3 - 4/4 = 1 - 4/3
x = -1/3

Check:
2x - y = -2
If x = -1/3 and y = 4/3...
2(-1/3) - 4/3 = -2
-2/3 - 4/3 = -2
Correct, so
x = -1/3 and y = 4/3

Answer 5

x=1 and y=0

Answer 6

Solve the first equation for x:
x = 1 - y

Plug that into the second equation:
2(1 - y) - y = -2

Distribute the 2:
2 - 2y - y = -2

Combine like terms:
-3y = -4

Divide -3:
y = 4/3

Plug the y into the first equation:
x + 4/3 = 1

Subtract the 4/3:
x = -1/3

x = -1/3 and y = 4/3

Answer 7

x=4/3 and y=(-1/3)

Answer 8

The first equation can be wrtten as

x=1-y. Sustituting this in equation 2 we get 2(1-y)-y=-2

or 2-2y-y=-2

or 2-3y=-2

or -3y=-4

or simply y=4/3

Substituting this value in equation 1 we get

x+4/3=1

Therefore x=1-4/3

that is x=-1/3

The solutions are therefore

x=-1/3
y=4/3

Its much more simpler solving linear equations

Answer 9

x+y=1 which can be written as -y=x-1,substitute the value of -y in the next equation
2x+x-1=-2
3x=-1
x=-1/3
so y=1-x
y=1+1/3
=4/3
The answer is x=-1/3 and y=4/3

Answer 10

2(x+y=1)---> 2x+2y=2
2x-y=-2----> 2x-y=-2

then would subtract those two, gettin rid of the 2x.
making it
3y=4
y=4/3

plug in y in one of the orignal problems.

x+y=1
x+4/3=1
x=-1/3

Answer 11

y=1-x, sub that in for y in other equation 2x-(1-x)=-2, you can do the rest on your own