To find the value of y, you need to plug a value into the x variable, in this case -8.
4x + 9y = -14 Substitute -8 for x
4 (-8) + 9y = -14 Multiply
-32 + 9y = -14 Start isolating the variable by adding 32 to both sides
9y = 18 Divide both sides by 9
y = 2
When x = -8, y = 2
2 possible answers: 130 or 132
answer 1: 10%of 100 is 10, 20% of 100 is 20 100+10+20=130
answer 2: 10% of 100 is 10 100+10= 110
20%of 110 is 22 110+22=132
Tyhir took a total of 16 lessons from Ms. Carter.
Work: 695-55 ( because the question is not asking for recitals). Then you do 640/40. That gives you an answer of 16.
Have a nice day!!!