00:01
So we're asked to solve the following system of equations.
00:02
We're given 5x plus y equals 0 and 5x plus 2y as equal to 30.
00:07
So we can go solve this system of equations a number of ways.
00:12
We're going to go ahead and use the method of substitution for this one.
00:17
So the first thing i'm going to do is choose an equation and a variable to solve for.
00:23
So in the first equation, we're going to look to solve for y.
00:26
So if we go ahead and solve for y in the first equation, we get that y is equal to minus 5.
00:31
I simply subtracted 5x from both sides of this equation.
00:36
The next thing i'm going to do is substitute in negative 5x into the second equation.
00:43
So wherever i see y in this equation, i'm just going to put negative 5x...