Algebra 1 – Lesson 2

3

April 8, 2013 by Meghan Riling

CODE A

#ask the user for the points
x1 = parseInt(prompt(“What is the x-value of the first point?”))
y1 = parseInt(prompt(“What is the y-value of the first point?”))
x2 = parseInt(prompt(“What is the x-value of the second point?”))
y2 = parseInt(prompt(“What is the y-value of the second point?”))

#find the difference in the y-values
yDifference =

#find the difference in the x-values
xDifference =

#divide to find slope
slope =

#report the slope to the user
alert( )

CODE B

#ask the user for the point and the slope
x = parseInt(prompt(“What is the x-value of the point?”))
y = parseInt(prompt(“What is the y-value of the point?”))
slope = prompt(“What is the slope of the line?”)

#we know that y = mx + b. that means that b = y – mx
#first do the m*x part
slopeByX =
#then subtract
b =

#tell the user their y-intercept
alert( )

CODE C

#ask the user for the point and the slope
x1 = parseInt(prompt(“What is the x-value of the first point?”))
y1 = parseInt(prompt(“What is the y-value of the first point?”))
x2 = parseInt(prompt(“What is the x-value of the second point?”))
y2 = parseInt(prompt(“What is the y-value of the second point?”))

#Use your first program to find the slope.

 

#Use the second program to find the y-intercept.
#Remember: you don’t need to ask for new info.
#You already know a point, and you just found the slope.

 

#Tell the user the equation of the line!
alert( )

CODE D

if(9 4)
  alert(“TRUE”)
else
  alert(“FALSE”)

if(7 7)
  alert(“TRUE”)
else
  alert(“FALSE”)

if(2 1)
  alert(“TRUE”)
else
  alert(“FALSE”)

if(14 2)
  alert(“TRUE”)
else
  alert(“FALSE”)

if(3 15)
  alert(“TRUE”)
else
  alert(“FALSE”)

CODE E

number = Math.floor(Math.random()*10)

#Describe the game to the user.
#FYI: The possible numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
alert( )

guess = 10

while(guess != number)

  guess = prompt(“Make a guess.”)

  if( )
    alert(“You got it!”)
  else if( )
    alert(“Go higher!”)
  else
    alert(“Go lower!”)

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3 thoughts on “Algebra 1 – Lesson 2

  1. Joel Krislov says:

    #Use your first program to find the slope.

    #ask the user for the points
    x1 = parseInt(prompt(“What is the x-value of the first point?”))
    y1 = parseInt(prompt(“What is the y-value of the first point?”))
    x2 = parseInt(prompt(“What is the x-value of the second point?”))
    y2 = parseInt(prompt(“What is the y-value of the second point?”))

    #find the difference in the y-values
    yDifference = y2 – y1

    #find the difference in the x-values
    xDifference = x2 – x1

    #divide to find slope
    m = yDifference / xDifference

    #Use the second program to find the y-intercept.

    #we know that y = mx + b. that means that b = y – mx
    #first do the m*x part
    slopeByX = m*x2
    #then subtract
    b = y2 – slopeByX

    #Remember: you don’t need to ask for new info.

    #You already know a point, and you just found the slope.

    #Tell the user the equation of the line!
    alert(“The equation is y” + “=” + m + “x +” + b)

  2. Joel Krislov says:

    number = Math.floor(Math.random()*10)

    #Describe the game to the user.
    #FYI: The possible numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
    alert( “I’m thinking of a number between one and ten. Guess.” )

    guess = 10

    while(guess != number)

    guess = prompt(“Make a guess.”)

    if(guess==number)
    alert(“You got it!”)
    else if(guess<=number )
    alert("Go higher!")
    else
    alert("Go lower!")

  3. […] -an entry on my programming club blog with code to copy (lesson 1 and lesson 2) […]

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