Question

how to solve the problem 2x+y=4, and x+y=-1.

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Answer 1

Step-by-step explanation:

hope this answer will be helpful

Answer 2

Answer:

x = 5 and y = -6

Step-by-step explanation:

This sort of equation where there are 2 variables is called a simultaneous equation.

Given:

x + y = -1

2x + y = 4

We know that:

x + y = -1

So, x = -1 - y                      [Equation 1]

and,

2x + y = 4

So,

2(-1 - y) + y = 4                   [From equation 1]

-2 - 2y + y = 4

-2 - y = 4

y = -6

So now we know the value of y

Taking equation 1:

x = 1 - y

so,

x = -1 - (-6)

x = -1 + 6

x = 5

Ans = x is 5 and y is -6

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