1) 4a + 8a = 2012a = 20a = 20/12a = 5/3
2) 92 - 7y = 36-7y = 36 - 92-7y = -56y = -56/-7y = 8
3) 4x + 7x = 1311x = 13x = 13/11x = 1.18 (rounded to two decimal places)
1) 4a + 8a = 20
12a = 20
a = 20/12
a = 5/3
2) 92 - 7y = 36
-7y = 36 - 92
-7y = -56
y = -56/-7
y = 8
3) 4x + 7x = 13
11x = 13
x = 13/11
x = 1.18 (rounded to two decimal places)