Let d represent the number of days she rented the bicycle.
123 = 55 + 8.50d
Answer:
50 of D and 10 of C
Step-by-step explanation:
First of all, put this data into 2 equations.
You sold 60 items, so C+D=60
C is $5 so we can represent it by 5C
D is $7 so we can represent it by 7D
You made $400 total from C and D, so 5C+7D=400
We can use simultaneous equations to solve this.
To eliminate one of these variables, we'll multiply the first one by 5 to make it 5C like the other.
5(C+D=60) (make sure you multiply both sides.)
so 5C+5D=300
5C+7D=400
Now we solve it:
5C-5C+7D-5D=400-300
7D-5D=100
2D=100
D=50
Now we can substitute this with one of the equations to find C
C+50=60
C=60-50
C=10
so, (10x5)+(50x7)=400
(f+g)(x) is basically equal to f(x)+g(x), so you're just adding the two functions together.
Answer: y = x - 1
Step-by-step explanation:
The yellow points are located at the points (1, 0) and (8, 7)
For a linear equation that pases trough the points (x1, y1) and (x2, y2), the slope is:
s = (y2 - y1)/(x2 - x1)
Then, for our equation, the slope is
s = (7-0)/(8-1) = 1
Then our linear equation is
y = 1*x + b
where b is the y-axis intercept.
To find b, we can use that when x = 1, y = 0
0 = 1*1 + b
b = -1
Then our equation is y = x - 1
Answer:
288
Step-by-step explanation: