thus, the first answer choice, y = sec x, is the correct one
it’s supposed to be -4+45=41
Option A: Multiply the top equation by , then add the equations.
When we multiply the top equation by we get:
Now, we add the second equation to this, we get:
5x + 2y + 5x - 2y = -1 + 2
The 'y' variable is eliminated.
OPTION B: Note that multiplying the second equation by 2 would result in:
10x - 4y = 4. To eliminate 'y' we should add this equation to the top equation not subtract it. So, this option is wrong.
Adding the equations also will result in a equation of two variables, viz:
15x + 2y = 0 which does not eliminate any variable at all.
So, OPTION C is also wrong.
Hence, OPTION A is the answer.