Solve the system with the addition method:
(7 x -4 y, =, 5)
(21 x -12 y, =, 15)
Solve the system with the addition method:
(7 x -4 y, =, 5)
(21 x -12 y, =, 15)
7x-4y = 5......(1)
21x-12y = 15......(2)
Since dividing each term of the equation (2) by 3 gives you the equation (1), you actually have only one equation with two variables. Therefore, the solution is
{t, (1/4)(7t-5)}, where t can be any number.