Step by step
The question
Question: is (−1, −3) a solution of 2x − y = 1.
2x − y = 1
is (−1, −3) a solution?
1 Read x and y
The first number is always x.
The second is y.
So x = −1 and y = −3.
(−1, −3) → x = −1, y = −3
Careful!
Do not swap them.
The first number in (−1, −3) is x.
Careful: not x = −3, y = −1 ✗
2 Put them in
Put x = −1 and y = −3 in.
2(−1) − (−3) =? 1
Work out each side.
−2 + 3 =? 1
Is 1 equal to 1?
Yes.
True!
1 = 1 true
It is true.
So (−1, −3) is a solution.
(−1, −3) is a solution
Let's look back.
First: read x and y.
Last: put them in.
Answer
(−1, −3) is a solution