00:01
Hello, so given this system of equations, so negative x plus 2y is negative 1, and then 5x minus 10 y is 6, well, i guess we want to multiply as the top equation, let's say, by 5, and then we get negative 5x, and then 5 times 2y becomes 10 y is then equal to 5 times negative 1, so it's not 5 to 5.
00:22
But then the bottom equation, we just leave alone, we have 5x minus 10x is equal to 6.
00:29
Now we see if we add this equation.
00:30
Together, what happens? the x's cancel, right? that's going to become zero, and the y's also become zero.
00:36
So we should zero is equal to negative five plus six, which is going to be one...