Math Help?? (Algebra 1) HELP PLEASE
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Math Help?? (Algebra 1) HELP PLEASE

[From: ] [author: ] [Date: 12-12-04] [Hit: ]
2. Suppose you have a $5-off coupon at a fabric store. You buy fabric that costs $7.50 per yard, Write an equation that models the total amount of money Y you pay if you buy X yards of fabric.3.......
I have tons of homework and I really need to move on to the other ones. So can someone help me with these 3 problems???

1. How would I graph Y=3x+4 (slope)

2. Suppose you have a $5-off coupon at a fabric store. You buy fabric that costs $7.50 per yard, Write an equation that models the total amount of money Y you pay if you buy X yards of fabric.

3.The temperature at sunrise is 65.F Each hour during the day, the temperature rises 5.F. Write an equation that models the temperature Y, in degrees Fahrenheit, after X hours during the day.

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1. How would I graph Y=3x+4 (slope)
The equation is of the form "y=mx+b".
The "m", 3, is the slope. The "b", 4, is the y-intercept (the y part of it).
Make one point the y-intercept (0, 4). The slope is 3; rise over run is 3/1. From (0, 4), go up 3 and then right 1, and plot a second point where you end up. Draw the line through the two points.

2. Suppose you have a $5-off coupon at a fabric store. You buy fabric that costs $7.50 per yard, Write an equation that models the total amount of money Y you pay if you buy X yards of fabric.
You pay $7.50 per yard times the number of yards, minus the $5 discount.
Y = 7.5X - 5

3.The temperature at sunrise is 65.F Each hour during the day, the temperature rises 5.F. Write an equation that models the temperature Y, in degrees Fahrenheit, after X hours during the day.
5° per hour times the number of hours, is added to 65°, to get the new or final temperature.
Y = 5X + 65

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1. y=3x+4
4 represents the y intercept (where the graph of the line hits the y intercept on a cartesian coordinate)
so draw your x and y axis,
go up four on the y axis and plot a point
3 represents the slope of the line (rise over run) basically saying that you rise 3 every time you run one
so from the first point that you plotted, go up 3 and to the right 1. this next point should be at (1,7)
connect the two points. this is your line

2. Y = 7.5X - 5
7.5 is multiplied by how many yards you buy and you must take into account the coupon.
think about it this way, if the fabric costs $7.50 per yard and you multiply that by 5 yards, yards will cancel and leave you with a dollar amount which is what you want in the case to be your Y value.

3. Y = 5X + 65
hope this helped

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1. Plot a poing at (0,4). From there go up three right one and down three left one. You should get (1,7) and (-1,1).

2. y= 7.50x - 5

3. y= 65 + 5x

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Y=65+5(x)
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