y = 7x + 12
1. y = 7(5) + 12
y = 35 + 12
y = 47
when x is 5 then y is 47
2. 82 = 7x + 12
7x = 82 - 12
7x = 70
7x/7 = 70/7
x = 10
when x is 10 then y is 82
3. y = 7(15) + 12
y = 105 + 12
y = 117
when x is 15 then y is 117
4. 152 = 7x + 12
7x = 152 - 12
7x = 140
7x/7 = 140/7
x = 20
when x is 20 then y is 152