Solve the system of equations using the elimination/addition method
In order to solve simultaneous equations, we need to multiply one of the equations with a constant so that the coefficient in front of one of the variables becomes the same as in the other but with the opposite sign. If the first equation is multiplied by , the coefficient in front of becomes in the first equation and in the second.
Now we can add the left and right hand sides of equation (I) to the right and left hand sides of equation (II) which cancels out the terms and allows us to solve for .
Now we substitute into equation (I) and solve for .
The solution for the simultaneous equations is then