Х+2у=0 х+у-2х+7у=8

To solve this system of equations, we can use the method of substitution.

1. From the first equation, we can solve for x in terms of y: x = -2y

2. Substitute x = -2y into the second equation: (-2y) + y - 2(-2y) + 7y = 8 Simplify: -2y + y + 4y + 7y = 8 10y = 8 Divide both sides by 10: y = 8/10 y = 0.8

3. Substitute the value of y back into the equation for x: x = -2(0.8) x = -1.6

So the solution to the system of equations is x = -1.6 and y = 0.8.