Step-by-step explanation:
I think, he made a mistake because the exponents have different values but then if you'll look at his results, he just wrote the same thing. If you want, you could post the original problem, and I'll solve it for you :)
Tina is saving to buy a notebook computer. She has two options. The first option is to put $400 away initially and save $20 ever
2 answers:
Answer:
The first option is to put $400 away initially and save $20 every month. Let she saves for x months. Equation becomes;
The second option is to put $100 away initially and save $40 every month. Let she saves for x months. Equation becomes;
Equating both as equal we will get the number of months.
=>
=>
x = 15
Hence, it will take 15 months to save the same amount.
And amount saved will be =
= $700
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Answer:
Step-by-step explanation:
A direct variation equation has the following format:
Where k is a constant.
We know that y is 12 when x is -2. Thus, substitute:
Divide both sides by -2:
So, our direct variation equations is:
To find what x is when y equals -6, substitute in -6 for y:
Divide both sides by -6:
So, our answer is 1 :)
Answer:
Make a table with values of x and y using the equation y + 3 = -1/4(x - 3) :
x y
0 -2.25
3 -3
5 -3.5
-1 -2
-9 0
Now, graph these and draw a line through the points:
