00:03
To use the elimination method, we need opposite coefficients on x or opposite coefficients on y.
00:09
And i'm going to go for opposite coefficients on y by multiplying my first equation by 7 and my second equation by 2.
00:18
So that gives me, for the first equation, 21x minus 14y equals 140.
00:27
And for the second equation, 4x plus 14y equals 10.
00:34
Now we can add these equations together, and we get 25x, the y terms eliminate, and then we have equals 150.
00:45
And if we divide both sides of that equation by 25, we get x equals 6.
00:50
Now to find the value of y, i'm going to number my equations 1 and 2, and i'm going to use either one of the two equations.
00:57
It doesn't matter which, and substitute the x value in.
01:01
So i'm going to use equation 2...