Question

The point (x, -2/5) lies on the graph of . The value of x is

Answer 1

Basically, all it's asking is solve the equation for x, and plug in the y-value which is given (-2/5) and find the value of x.

So, let's find out the equation for x:

`y = (4-2x)/(5)`

`5y = 4-2x`

`5y-4 = -2x`

`(5y-4)/(-2) = x`

Now, we have an expression, we can just plug in the y-value given to us and solve for x:

`(5y-4)/(-2) = x`

`(5( (-2)/(5)) -4)/(-2) = x`

Notice that the 5s cancel out and you are left with:

`(-2 -4)/(-2) = x`

`(-6)/(-2) = x`

`x = 3`

So, the x-value is 3!