Question

x+y=4; 3x-y=9

please solve ​

Answer 1

❥︎❥︎ANSWER☃️✨࿐

/ Solve equation [1] for the variable x

[1] x = y + 4

// Plug this in for variable x in equation [2]

[2] -3•(y +4) - 2y = 9

[2] - 5y = 21

// Solve equation [2] for the variable y

[2] 5y = - 21

[2] y = - 21/5

// By now we know this much :

x = y+4

y = -21/5

// Use the y value to solve for x

x = (-21/5)+4 = -1/5

✶⊶⊷⊶⊷❍⊶⊷⊶⊷✶

Answer 2

Answer:

step by step explanation:

Solve equation [2] for the variable y

[2] y = -3x + 9

Plug this in for variable y in equation [1]

[1] x - 2•(-3x+9) = -4

[1] 7x = 14

Solve equation [1] for the variable x

[1] 7x = 14

[1] x = 2

By now we know this much :

x = 2

y = -3x+9

Use the x value to solve for y

y = -3(2)+9 = 3

Answer (x,y)=(2,3)