Which equation represents a proportional relationship? a) y = 2 5 x b) y = 1 3 x + 5 c) y = −3x − 1 d) y = 2x + 0.5

15 write your number

Sry i’m so bad at math! wish i could answer #imdumb

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.