Step by step
The question
Question: is (2, 1) a solution of 3x + y = 7.
3x + y = 7
is (2, 1) a solution?
1 Read x and y
The first number is always x.
The second is y.
So x = 2 and y = 1.
(2, 1) → x = 2, y = 1
Careful!
Do not swap them.
The first number in (2, 1) is x.
Careful: not x = 1, y = 2 ✗
2 Put them in
Put x = 2 and y = 1 in.
3(2) + 1 =? 7
Work out each side.
6 + 1 =? 7
Is 7 equal to 7?
Yes.
True!
7 = 7 true
It is true.
So (2, 1) is a solution.
(2, 1) is a solution
Let's look back.
First: read x and y.
Last: put them in.
Answer
(2, 1) is a solution