Solve the system with the addition method: {(-20 x -16 y, =, 8),(-5 x -4 y,=, 2)

Question

Solve the system with the addition method:

{(-20 x -16 y, =, 8),(-5 x -4 y,=, 2)

Answer 1

-20x - 16y = 8

-5x -4y = 2.

Multiply the second equation by -4 to get

20x + 16y = -8

Adding it to the first equation, we get

0 = 0

Since this solution is valid regardless of the value we put in for x, the solution set is all real numbers.