First part from the working out
<span>$15
Write down some equations that express what you know.
A = 2*30 + 3x
K = 1*30 + 5x
A+K = 210
Substitute the expression for A in the A+K=210 expression
2*30 +3x + K = 210
Now substitute the expression for for K
2*30 + 3x + 1*30 + 5x = 210
Multiply and combine terms
60 + 3x + 30 + 5x = 210
90 + 8x = 210
Subtract 90 from both sides
8x = 120
Divide both sides by 8
x = 120/8 = 15
The cost of one month of game play is $15</span>
Answer:
Option C. x=-3
Step-by-step explanation:
we have
----> inequality A
solve for x
subtract 60 both sides
Divide by -15 both sides
Remember that when you multiply or divide both sides of an inequality by a negative number, you must reverse the inequality symbol
The solution of the inequality A is the interval [-3,∞)
we have
----> inequality B
Solve for x
subtract 11 both sides
Divide by 14 both sides
The solution of the inequality B is the interval (-∞,-3]
The solution of the system is
(-∞,-3] ∩ [-3,∞) =-3
therefore
The solution is x=-3