Matt H. answered • 01/26/15
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What are these letters doing in my equations? Here comes algebra!
Let's call Amy "a", and Randall "a + 6."
in 7 years, a will turn into a + 7, and a + 6 will be a + 6 + 7, or a + 13. SO...
a + 7, plus a + 13 will be 46
so 2a + 20 = 46
2a = 26
a = 13
So Amy is 13 now, and Randall is 6 years older, so he's 19 now.
Make sense?
Matt
Jessica A.
Three times a number decreased by six is between -30 and 57
Can you please help me with this one it has to be in interval form.
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01/26/15
Matt H.
- 30 < (3n - 6) < 57
I think is what they mean.
"Negative 30 is less than (3n minus 6), which is less than 57."
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01/26/15
Jessica A.
Hello matt, hiw are you. Can you help me with somenproblems please?
I opened a grocery account at my bank with $200. Every week thereafter, I withdraw $50 from the account to pay for groceries.
If x is the number of weeks I've had the account, then y is the amount in the account.
Find an equation of a line in the form y = mx + b that describes my grocery account balance.
If x is the number of weeks I've had the account, then y is the amount in the account.
Find an equation of a line in the form y = mx + b that describes my grocery account balance.
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02/02/15
Jessica A.
A mother gives birth to a 6 pound baby. Every 4 months, the baby gains 2 pounds.
If x is the age of the baby in months, then y is the weight of the baby in pounds.
Find an equation of a line in the form y = mx + b that describes the baby's weight.
If x is the age of the baby in months, then y is the weight of the baby in pounds.
Find an equation of a line in the form y = mx + b that describes the baby's weight.
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02/02/15
Matt H.
Hi Jess--
I posted solutions to these last night but they disappeared! I'll try again:
"the amount in the account will equal the original 200 dollars minus 50 dollars for each week," so...
y = 200 - 50x
And the next one:
"The weight of the baby will be the original 6 pounds, plus 1/2 pound for each month." (You get that because 2 pounds in 4 months equals one-half pound each month.) So...
y = 6 + 1/2 x
To graph these, pick a sensible y value, put it into the equation (use the story to help visualize) and then graph the x,y pair that you get. Do that with one more y value to get one more pair, graph that one, and draw your line through the two points.
I hope you get these on time, and that they help.
Also, you should think about starting a separate thread when you have a new question. That way more tutors can see/help you out. (I'm happy to help of course, but I'm not always around!)
Have a great day.
Matt
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02/03/15
Jessica A.
01/26/15