equations

posted by .

I am not great at equations... I keep practicing and working these problems and questions out but I always seem to get different answers can someone please guide me on how or tell me the correct way to work these problems out>>

The linear equation

y=0.15x + 0.79


represents an estimate of the average cost of gas for year x starting in 1997. The year 1997 would be represented by x = 1, for example, as it is the first year in the study. Similarly, 2005 would be year 9, or x = 9.


a)What year would be represented by x = 4?

My answer is = year 2000

b)What x-value represents the year 2018?

x= 22

c)What is the slope (or rate of change) of this equation?

How or where do I start on this one??

d)What is the y-intercept?

e)What does the y-intercept represent?

f)Assuming this growth trend continues, what will the price of gasoline be in the year 2018? How did you arrive at your answer

  • equations -

    represents an estimate of the average cost of gas for year x starting in 1997. The year 1997 would be represented by x = 1, for example, as it is the first year in the study. Similarly, 2005 would be year 9, or x = 9.


    a)What year would be represented by x = 4?

    My answer is = year 2000
    2000 is correct. You might make the next part easier by looking at how this was done, instead of just counting up 4.
    1996 + 4 = 2000.


    b)What x-value represents the year 2018?
    1996 + 18 = ??
    x= 22

    c)What is the slope (or rate of change) of this equation?
    The equation for a straight line is
    y = mx + b where m is the slope. The equation given is
    y=0.15x + 0.79; therefore, 0.15 is the slope.

    How or where do I start on this one??

    d)What is the y-intercept?
    The y intercept is the 0.79 in the original equation. It is the point at which the line crosses the y axis (and x = 0 at that point).
    e)What does the y-intercept represent?
    See answer above.
    f)Assuming this growth trend continues, what will the price of gasoline be in the year 2018? How did you arrive at your answer
    Use the equation, plug in x for the number of years (check me out but I think that will be 22) and solve for y.

  • equations -

    thank you dr. bob

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. thx 4 the help roger

    thx 4 the help i got the steps You're welcome and I'm glad you understood the steps. Now use that strategy with your other word problems. Identify what the variable(s) are, convert them to equations, then solve the equations. Always …
  2. Maths (Simultaneous equations)

    You know f(x)= ax² + bx + c. Well when you get the equations why is it always like: 1) a + b + c = something 2) 4a + 2b + c = something 3) 9a + 3b + c = something I mean why is the first one always 'a+b+c'?
  3. math ,hep, plz

    can someone help explain this for me please... Problem #1 What values for x must be excluded in the following fraction?
  4. math,help

    on one of last week homeworks i got this one wrong can someone explain to me what is the correct format. The demand supply equations for a certain item are given by: D= -5p+40 S=-p^2+30p-8 The correct answer was: $1.43 how do you get …
  5. algebra attn Reiny

    Thanks for your help with the solving of the three equations! Yes, it was a typo. I just finished solving it a long way, solving for the 1st 2 equations then the 2nd and 3rd and plugging in variables...etc. etc. Your way gave the same …
  6. Equations

    find the slope of the line containing the following points: (5/6 , -5) (-1/3, -1/3) can someone please help me I keep getting different answers.. I am not good at fractions especially with the negative signs... thanks
  7. equations

    I am not great at equations... I keep practicing and working these problems and questions out but I always seem to get different answers can someone please guide me on how or tell me the correct way to work these problems out>> …
  8. algebra uno help + check?

    So, I've got these other sets of problems, that are telling me to write equivilant equations for the equations given, heres what I think. 1) x+y=-10 -5+5=10 -5(2)+10 2) 5x+10y=15 5x(3)=15 5x+10=15 3)-x+2y=9 y=3(3)=9 3+6=9 Heres what …
  9. medical terminology

    I'm taking the medical terminology course and I'm at the part of the course that is working with ICD 9 CM codes. I'm in Chapter 2 of the Medical & Dental Associates, P.C. Insurance Forms Preparation work book and now I'm trying to …
  10. Explanation of Maths Question

    Can someone please explain what does these questions mean?

More Similar Questions