The square of a number is 15 more than 2 times the number
1 answer:
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Answer:
Part a) The budget is $40
Part b) The cost of one gallon of gasoline is $3.55 and the cost of the car wash is $8
Part c)
Part d) see the explanation
Step-by-step explanation:
The complete question in the attached figure
Part a) What is your budget?
The budget is given by the equation
y=40
therefore
The budget is $40
Part b) How much does a gallon of gasoline cost? how much does a car wash cost?
Let
y ------> the cost of a gallon of gasoline plus the cost of a car wash
x -----> the amount of gasoline in gallons
we have
y=3.55x+8
In this problem
For x=0
y=3.55(0)+8=8
The y-intercept is the cost of the car wash
so
The cost of the car wash is $8
Find the cost of one gallon of gasoline
we know that
The slope of the linear equation is
m=$3.55 per gallon
therefore
The cost of one gallon of gasoline is $3.55
Part c) Write an inequality that represent the possible amounts of gasoline you can buy
we have
Solve for x
Part d) Use the graph to estimate the solution of the inequality in part c)
we have the system
y=40
y=3.55x+8
The solution of the system is the intersection point both graphs
Looking at the graph the intersection point is about (9,40)
That means ----> The maximum amount of gasoline you can buy with the budget is about 9 gallons
