Answer:
Step-by-step explanation:
The system of equations (a) is the correct one for this situation. We must now solve this system for x and y, which are the unit costs.
Multiplying the 2nd equation by (-3/2) yields -12x - 18y = -168.
Now eliminate x by combining the two equations
12x + 5 y = 116
-12x -18y = - 168
-------------------------
-13y = -52, or y = 4.
If y = 4 then 12x + 5y = 116, or
12x +5(4) = 116, or
12x + 20 = 116, or
12x = 96, or x = 8
Roller pens are $8/dozen and ball point pens are $4 per dozen.
Answer:
Yes
Step-by-step explanation:
Answer:
They are the same
Step-by-step explanation:
The degree is basically all of the exponents added up. So:
A) 2+4 = 6
B) 2+3+1 = 6
(since x to the power of 1 is x)
So, they are the same
Answer:
4.A
5.c
Step-by-step explanation:
4.112+x=180
x=180-112=68
A
5.
7x+3x-30=90
10x=90+30
10 x=120
x=12
c
Standard form : Ax + By = C
3x = 6y + 8...subtract 6y from both sides
3x - 6y = 8 <===
