Answer:
Option D is right,.
Step-by-step explanation:
-a+4b+2c=-8 ... i
3a+b-4c=9 ... ii
b=-1 ... iii
Substitute the value of b, in i and ii
-a-4+2c =-8 or -a+2c = -4
and 3a-1-4c = 9 or 3a -4c =8
Now we have two equations in two variables
-a+2c =-4 and 3a-4c =8
a = 2c+4: substitute this in the other equatin.
3(2c+4)-4c =8 Or 2c +12 =8
2c =-4 or c = -2
Substitute in -a+2c =12
-a-2 = -4
a = -2+4 =2
a=2, b=-1 and c =-1 is the solution.
Y=mx+b
y=(1200-2x)/3
y=1200/3-2/3x
y=400-2/3x
y=-2/3x+400
Answer:
do you have a picture?
Step-by-step explanation:
Answer:
m= 90, I couldn't figure out n
Step-by-step explanation:
Answer:
20
Step-by-step explanation:
Because 21.50 x 20 =430
and 18 x 20 = 360
then you add 70 to 360 and you get 430
so Katrina would have to order 20 shirts from each company in order for the cost to be the same.
