You first want to get <em>y</em> alone.
So, get rid of the -5 by adding 5 to both sides.
That leaves you with 8 = y.
You can check by plugging 8 back in for y.
3 = -5 + (8).
Since that is a true statement, our answer is correct.
X = number of lessons, y = total cost
y = 15x + 20 <== ur equation
when total bill was 125...y = 125
125 = 15x + 20
125 - 20 = 15x
105 = 15x
105/15 = x
7 = x <=== if Bill took 7 lessons, it would cost 125 <==
Answer:
1. x > 125
2. y ≥ 17
3. x ≥ -11
Step-by-step explanation: