Question

use substitution to determine whether the point is on line y=3x+7; A(2,13)

Answer 1

We have the point (2,13)

That means (x,y) = (2,13) which breaks down to x = 2 and y = 13

Answer 2

To see if (2,13) is on the line, we just plug in (x,y) = (2,13)

If we get a true equation, then the point is indeed on the line.
If we get a false equation, then the point does not lie on the line (no matter how close it looks)


y = 3x+7

13 = 3*2+7 ... plug in x = 2 and y = 13

13 = 6+7

13 = 13 ... true equation


So this proves that (2,13) is on the line y=3x+7

Answer 3

thank you very much

Answer 4

you're welcome