Question

Please help me i'm being timed

Answer 1

`y = 3`

Explanation:

Given system of equations ,

`\begin{cases} -x +y = 6\dots (i) \\ 2x -5y = -21 \dots (ii)\end{cases}`

2(i) + (ii) :-

`\implies -2x +2y +2x -5y = -21+12`

Simplify RHS and LHS ,

`\implies -3y = -9`

Divide both sides by -3 ,

`\implies \boxed{ y = 3}`

Answer 2

x - coordinate of the solution of given system of linear equations is :

• -3

now, let's plug the value of x as -3 in the first equation, we get :

• 
  `- x + y = 6`

• 
  `- ( - 3) + y = 6`

• 
  `3 + y = 6`

• 
  `y = 6 - 3`

• 
  `y = 3`

therefore, value of y = 3

correct choice - b