| Solved by pluggable solver: Linear Systems by Addition |
| We'll solve the system: by elimination by addition.To eliminate by addition, we need to set both coefficients of x to numbers with changed signs, i.e a and -a. Since in the second equation we have 2 as our coefficient for x, to get -1 we have to multiply all terms of the second equation by Multiplying, we get on our second equation: Adding both equations we get: Since 1 and -1 cancel out, we have a linear equation:Therefore, we know that y = -2. Plugging that in into the first equation gives us: Therefore, our answer is: |