I watched the video by dint get any thing
I’ll give u brainliest u we’d allowed if they hem

Step-by-step explanation:

3:4   9:12

Yes. Because if you have 3 3's to make the 9, you also have 3 4's to make the 12

18:15     9:5

No, because you have 2 9's to make the 18, but it takes 3 5's to make the 15.

1/2   20:40

I believe this one is true since 20 is half of 40

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)