Solving the equations {x + y = 1 2x + y = 3}

X = 1 - Y
So x is replaced by 2x + y = 3
We obtain 2 (1 - y) + y = 3
2 - Y = 3
Get y = - 1
X = 2

Solving equations y = 2x x + y = 3

Take y = 2x into the second equation, that is, x + 2x = 3, get x = 1, and then get y = 2x = 2 from the first equation, so x = 1, y = 1
=2

RELATED INFORMATIONS

1. The solutions of the equations {y = 2x, x + y = 3 are
2. Solve the equations 32x − 12Y = − 1x + 2Y + 10 = 0
3. If the equations x + 2Y = n, 2x-y = 7 and 4x + y = 5, x + 3Y = m have the same solution, find the value of M, n
4. Focus coordinates of straight line 3x + 10y-25 = 0, ellipse x2 / 25 + Y2 / 4 = 1 Is to find the coordinates of the intersection point
5. If s: y = 1:2:1:3, Y: z = 2:3, then x: Y: Z is equal to Also: given that X: y = 1.5: Y: z = 2 / 3: 5 / 6, find X: Y: Z
6. If two parts x equals three parts y equals four parts Z is not equal to 0, find x plus y minus Z parts x plus y plus Z
7. Given that X / 3 = Y / 5 = Z / 7 is not equal to 0, then X-Y + Z / y =?
8. Given that X / 3 = Y / 5 = Z / 7 is not equal to 0, find the value of X-Y + Z / y
9. Solving the equation system x + y = 5, x + Z = - 2, Z + x = 3, x + y + Z is equal to
10. How to prove that a function analytic and bounded in the whole complex plane is a constant function
11. If the equations MX + 2ny = 4, x + y = 1 and X-Y = 3, NX + (m-1) y = 3 have the same solution
12. It is known that the equations MX + 2ny = 4, x + y = 1 and X-Y = 3, NX + (m-1) y = 3 are equal Finding the same solution of (1) (2) The value of m n
13. Given that m and N are constants, if the solution set of inequality - mx-n > 0 is x0, what is the solution set
14. Factorization: x15 + x14 + x13 + +x2+x+1．
15. 8a（x—a)+4b（a—x)—6c（x—a)=?
16. Factorization of (x ^ 2-4x + 2) (x ^ 2-4x + 6) You're decomposing a factor for me （x^2-2x)(x^2-2x+2)+1
17. Factorization, finding rules 1.9x ^ 2 + 16y ^ 2-12z ^ 2, 2. Find the law, 9,4, - 1, - 5,,
18. Seek several factorization! x^2+9x+20 x^2-5x+6 x^2+x-2 x^2+x-2 x^2+x-2 x^2-3x-18 -x^2+7x-12 -x^2-x+6 2x^2-4x-30 -5x^2+25x+120
19. 1、 Square of (- 2aX) * (- 2 / 5x to the fourth power, y to the cube, Z to the cube) / (- 1 / 2a to the fifth power, XY to the square) - 1 power 2、 The square of X - (x + 2) (X-2) - (x-1 / x) 3、 [(x + y) square - (X-Y) square] / (2XY)
20. Decomposition factor: 16A ^ 2B + 16A ^ 3-4ab ^ 2 Urgent