FIND THE ERROR Jason and Daniela are solving a system of equations. Is either of them correct? Explain your reasoning.

Jason
2r+7tr−9t2r+7t(−)2r−18t25tt2r+7t2r+7(1)2r+72r2r2r============11−711−142511111114422
The solution is (2,1).
Daniela
2r+7t(−)r−9tr2r+7t2(18)+7t36+7t7t7t7t=========11−718111111−25257−3.6

The solution is (18,−3.6).