math

A math contest consists of ten problems.Three points are given for each correct answer. One point is deducted for each incorrect answer. Andy answers all the problems and scores 18 points. How many correct answers does he have?

  1. 👍
  2. 👎
  3. 👁
  1. x = number of answers
    y = number of incorrect answers
    3 x - y = 18
    x + y = 10
    add the two equations and solve for x

    check your answer

    1. 👍
    2. 👎
  2. How do you that rbowh? I am really bad at this.(step by step please)

    1. 👍
    2. 👎
  3. What part of the explanation don't you understand?

    1. 👍
    2. 👎
    👤
    Ms. Sue
  4. How to solve for x.(i am terrible at this)

    1. 👍
    2. 👎
  5. what did you get when you added the two equations?

    1. 👍
    2. 👎
  6. That is what I don't get.Please can you show me how to do it.

    1. 👍
    2. 👎
  7. by the way, x represents number of correct answers - I left that out initially

    1. 👍
    2. 👎
  8. Step by step is what I meant.

    1. 👍
    2. 👎
  9. (3x - y) + (x + y) = 18 + 10

    4 x = 28

    x = ?

    1. 👍
    2. 👎
  10. Thank you very kind sir/ma'am you were a big help.

    1. 👍
    2. 👎
  11. You're welcome Matt.

    1. 👍
    2. 👎
  12. 3*0=0
    3*1=3
    3*2=6
    3*3=9
    3*4=12
    3*5=15
    3*6=18

    1. 👍
    2. 👎
  13. 3x+y=18
    x+y=10
    x=4

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. ela

    standard english unit test 1.Which pronouns correctly complete the sentences? Drag and drop the words into the correct locations.(1 point) 2.Which intensive pronoun correctly completes the sentence? Select the correct answer from

  2. Physics

    If 500 J of work are required to carry a charged particle between two points with a potential difference of 40V, the magnitude of the charge on the particle is: a) 0.040 C b) 12.5 C c) 20C D) cannot be computed unless the path is

  3. Mathematics

    There are 45 questions in an exam.for every correct answer 5 points and every wrong 3 points is deducted.if she got 185 point.how many correct answers did she get...

  4. math

    I have no idea where to start! *A quick quiz consists of 3 multiple choice problems, each of which has 4 answers, only one of which is correct. If you make random guesses on all 3 problems, (a) What is the probability that all 3

  1. biology

    On a television talk show, a guest claims that people who exercise vigorously for 15 minutes or more every day are able to solve math problems more rapidly than people who have no vigorous exercise in their daily routine. Describe

  2. Math

    1. 2(y + 1) for y = 2 (1 point) 6 5 7 8 2. start fraction lower d plus lower g over lower h end fraction for d = 29, g = 16, and h = 9 (1 point) 8 2.375 5.375 5 3. The cost in dollars of a school banquet is 74 + 12n, where n is

  3. English grammar

    Use a singular verb with sums of money or periods of time. Ex) Ten dollars _____ a high price to pay. Ten dollar is a sum of money, so you have to use a singular verb. In this case, the subject acts as a unit. I'll give you

  4. Math

    Yolanda completed 14/25 of her math problems before her break and 1/5 of her math problems after her break. What fraction of her math problems did she complete?

  1. Math

    In a mathematics quiz, 20 problems are given, 5 points are given for each correct answer and 2 points are deducted for each incorrect answer. Ashley scores 51 points. How many correct answers does she have?

  2. mathematics

    a class of ten students took a math exam. each problem was solved by exactly seven of the ten students the first nine students in the class solved exactly four problems each . what is the number of problems solved by the tenth

  3. math

    Please solve this word problem, It will take at least 360 points for Kiko"s team to win the math contest. The scores are 94,82, and 87, but one of Kiko's teammates lost 2 of those points for an incomplete answer. How many points

  4. Geometry

    W, R, and S are points on a number line, and W is the midpoint of point RS. For each pair of coordinates given, find the coordinate of the third point. Please correct me if I'm wrong! 1. R=4, S=-6 Answer: W=-1 2. W=-4, S=2 Answer:

You can view more similar questions or ask a new question.