Question

What is the value of y if (3,y) is a solution to the equation 5x-3y=18

Answer 1

(x, y) → (3, y) → x = 3

Put the value of x to the equation:

5(3) - 3y = 18

15 - 3y = 18 subtract 15 from both sides

-3y = 3 divide both sides by (-3)

y = -1

Answer: y = -1

Answer 2

`5x - 3y = 18`

x=3


`5 * 3 - 3y = 18`

Do the multiplication


`15 - 3y = 18`

Put in the other side


`- 3y = 18 - 15`

Subtract


`- 3y = 3`

Put into fraction


`y = (3)/( - 3)`

Divide.


`\boxed {y = - 1}`

Solution: (3, -1)