Question

(04.03 LC)

Create an equivalent system of equations using the sum of the system and the first equation.
-3x + y = 12
x + 3y = 6​

Answer 1

-3x + y = 12

-2x + 4y = 18

Explanation:

first equation of new system would be the same as first one given:

-3x + y = 12

-3x+y + x+3y = -3x + x + y + 3y = -2x + 4y

12 + 6 = 18

so the second equation would be: -2x + 4y = 18