Question

If 2x−3y=11 and 3x+15=0, what is the value of y? These are the choices given:

a) -7 b)-5 c)-1/3 d)3 e)10

Answer 1

a) y = -7.

Explanation:

2x − 3y = 11

3x + 15 = 0

From the second equation:

3x = -15

x = -5.

Substitute this value in the first equation:

2(-5) - 3y = 11

-10 - 11 = 3y

3y = -21

y = -7.

Answer 2

A.-7

Explanation:

If
`2x-3y=11` and
`3x+15=0`

To know the value of y we need to clear x in the equation
`3x+15=0` and the result replace it in
`2x-3y=11`.

Then, let's clear x in the equation
`3x+15=0`

`3x=-15\\x=-(15)/(3) =-5`

Substituting the value of x in the equation
`2x-3y=11`

`2(-5)-3y=11\\-10-3y=11\\-3y=11+10\\y=(11+10)/(-3) \\y=(21)/(-3)\\ y=-7`