Question

6x+3y=15 for y.What does y equal if x=2?if x=5?​

Answer 1

1 and -5

Explanation:

let's start with moving y to one side for convenience sake.

6x+3y=15

subtract 6x on both sides

3y=15-6x

divide by 3 on both sides

y=5-2x

all you have to do is replace x with whatever number you want it to equal. starting with 2:

y=5-2(2)=5-4=1

now let's replace x with 5

y=5-2(5)=5-10=-5

Answer 2

if x = 2 , y = 1

if x = 5 , y = -5

Explanation:

6(2) + 3y = 15

12 + 3y = 15

12 + 3(1) = 15

y = 1

6(5)+3(y) = 15

30 + 3(-5) = 15

30 - 15 = 15

y = (-5)