Question

If (3, -2) is a solution of the linear equation 3x – py – 7 =0, then find the value of p.

Answer 1

-1

Explanation:

So to solve this, it tells you that (3, -2) is a solution so you can substitute x = 3 and y = -2 into the equation which would look like this:

`3*3-p*-2-7 = 0`

Then, you solve the equation for p:

first, simplify the left side

`9 +2p-7=0\\2+2p=0`

subtract 2 from both sides

`2p=-2`

divide both sides by 2

`p=-1`

Now, you have p = -1!

hope that makes sense :D