00:01
But this problem, we're solving the equation, and we're going to justify our steps as we go.
00:05
When i begin these, i like to put it so that variables are on the left -hand side.
00:09
So i'm going to go ahead and subtract 18 -r from both sides.
00:12
Since i am subtracting both sides by 18 -r, my reasoning is going to be subtraction property of equality.
00:18
Now, instead of writing out property of equality, i'm just going to put poe.
00:22
Now i'm going to go ahead and subtract.
00:24
So 5 minus 18 is negative 13 -r, minus 9 is equal to 2.
00:30
From here, i'm going to move the nine to the right.
00:33
So to move it to the other side and get it to cancel on the left, i need to add.
00:37
Since i'm adding, this will be the addition property of equality.
00:41
And the purpose behind it is just to make sure that we're isolating our variable.
00:45
So now i have negative 13r is equal to 11.
00:49
I'm gonna finish by dividing both sides by negative 13.
00:53
So because i'm dividing, then this is going to be my division property of equality.
00:59
So my final answer here cannot be simplified, so i have negative 11 over 13...