Answer:
There are three possibilities for the given question,
Case 1 : if question is,
x + y = 12 -----(1) ; x - 3y = - 30 -----(2),
Subtraction equation (1) and Equation (2),
We get,
4y = 42
[tex]\implies y = \frac{42}{4}=\frac{21}{2}[/tex]
Case 2 :
If the equations are,
x + y = 1 ----(1); 2x - 3y = -30-----(2),
Equation (2) - 2 × Equation (1),
We get,
-5y = -32
[tex]\implies y=\frac{32}{5}[/tex]
Case 3 :
if the equations are,
x + y = 12x - 3y = - 30
⇒ x + y = - 30 ------(1)
And, 12x - 3y = - 30 ------(2)
Equation (2) - 12 × Equation (1),
We get,
-3y - 12y = - 30 + 360
⇒ - 15 y = 330
Dividing both sides by - 15,
⇒ y = -22
