Question

Explain hard to tell whether (2,-1) is a solution of the equation Y= 3X -2 without using the graph

Answer 1

Considering the equation given:

`y= 3x -2`

As a function:

`f(x)= 3x -2`

`$(2, -1)$` states for
`(x, y)`, which means,
`x=2` and
`y=-1`

`f(2)= 3(2) -2\\f(2)= 6-2\\f(2)= 4`

`4\\eq -1`

Therefore,
`$(2, -1)$` is not a solution for the equation given and for the function.