Question

2x + y = 19
2x + 3y = -3​

Answer 1

Answer:

$2x + 3y = - 3 \\ 2x + y = 19 \\ 2y = - 22 \\ y = \frac{ - 22}{2 } = - 11$

$2x + y = 19 \\ 2x + ( - 11) = 19 \\ 2x - 11 = 19 \\ 2x = 19 + 11 \\ 2x = 40 \\ x = \frac{40}{2} = 20$

$x = 20 \:, \: y = - 11$

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Answer 2

Answer:

Solve equation [1] for the variable x

[1] x = y - 7

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

[2] 2•(y -7) + 3y = -19

[2] 5y = -5

// Solve equation [2] for the variable y

[2] 5y = - 5

[2] y = - 1

// By now we know this much :

x = y-7

y = -1

// Use the y value to solve for x

x = (-1)-7 = -8

Solution :

{x,y} = {-8,-1}