Explanation:
4y = - 4x +20 (2x) + 4y = 12
4y = -4x + 40x + 4y = 12
36x = 4y - 4y _12
36 x = 12
÷12
36x ÷ 12 = 12 ÷ 12
3x = 1
÷3
3x ÷ 3 =1
x = 1 over 3
7.8m questions
10.5m answers