:( solve equation for y. then find the value of y for the given value of x?

15x + 4y = 9

4y = 9 - 15x

y = (9 - 15x)/4

Answer: (9 - 15x)/4 OR 9/4 - 15/4x

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= 9/4 - 15/4(- 3)

= 9/4 + 45/4

= 54/2 or 27/2

Answer: y = 27/2 or 13 1/2

Checking original equation:

15(- 3) + 4(27/2) = 9

- 45 + 108/2 = 9

- 45 + 54 = 9

9 = 9

Solve the equation for y would possibly mean making y the subject of the equation, or in other words, changing our equation to "y = ..."

So we do this:

4y = 9 - 15x

y = (9 - 15x) / 4

Now substituting into this equation, the given value of x:

y = [ 9 - 15 (-3) ] / 4

y = [ 9 + 45 ] / 4

y = 54 / 4

y = 13.5

First you need to plug X into your equation. So,,,

15X + 4Y = 9 becomes

(15*-3) + 4Y = 9 Simplify your equation

-45 + 4Y = 9 Now simply balance the equation so y is alone by adding 45 to both sides

-45+45 + 4Y = 9+45

4Y = 54 Then divide by 4 to make y all alone and you have your answer.

4y/4 = 54/4

y = 13.5

Solving the equation means simplifying it.

Like this:

15x+4y=9

or, 4y=9-15x

0r, y=(9-15x)/4

Now y will have different values, for different values of x.But it's given that x=-3, So, y=(9-15x(-3))/4

=(9+45)/4

=27/2=13.5

15x + 4y = 9

subtract 15x on both sides: 4y = 9 - 15x

divide both sides by 4: y = 9/4 -15x/4 = 2 1/4 - 3 3/4 x

Now, for x = -3, this gives:

y = 2 1/4 - 3 3/4 * -3 = 2 1/4 + 11 1/4 = 13 1/2

15x + 4y = 9

4y = 9 - 15x

y = [9-15x]/4

Now

Substitute the value of x in the given equation.

Then you get,

y = [9 - 15*(-3)]/4

= [9 + 45]/4

= 54/4

= 27/2 = 13.25

8

y = (9-15x)/4

y= (9+45)/4=54/4=27/2

after solving for y , y=(9-5x)/4

now substituting x=-3

y=(9+15)/4=24/4=6

y=6