Question

which of the following

Answer 1

SOLUTION

We want to find which of the following is a solution to

$2x-y=-1$

Let's try the first option (2, -1)

So, the first value will be x, so if we get y as 1, then this option is correct

Now replacing x for 2 in the equation, we have

$\begin{gathered} 2x-y=-1 \\ 2(2)-y=-1 \\ 4-y=-1 \\ y=4+1 \\ y=5 \end{gathered}$

So, this is not correct. Let us try the next option (1, 2)

Let's put x to be 1 and see what y becomes

$\begin{gathered} 2x-y=-1 \\ 2(1)-y=-1 \\ 2-y=-1 \\ y=2+1 \\ y=3 \end{gathered}$

So, when x = 1, y =3, If you look at the 4th option, we can see (1, 3), which means x = 1 and y = 3, hence

the correct answer is (1, 3) the 4th option