Question

Which of the following points lies on the line whose equation is y = 2x - 3?

I think it's (-1, 4) can you please verify this for me so I can know if I'm right?

Medal being given!!

Answer 1

Let's find out.

(-1,4) means x = -1 and y = 4. So let's replace x with -1 and y with 4

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y = 2x - 3

y = 2(-1) - 3 ... replace x with -1

4 = 2(-1) - 3 ... replace y with 4; now simplify

4 = -2 - 3

4 = -5 ... false

the last equation is false, so y = 2x - 3 is false when (x,y) = (-1,4)

This means (-1,4) is NOT on the line y = 2x - 3

Answer 2

Okay, so would (0, 3, be it?

Answer 3

plug in (x,y) = (0,3) and see if you get a true equation or not

Answer 4

y = 2x - 3

3 = 2(0) - 3 .. plug in (x,y) = (0,3)

3 = 0 - 3

3 = -3 ... false

So (0,3) is NOT on the line

Answer 5

So that means I'm left with (1, -1) :)

Answer 6

try it out