Answer:
Step-by-step explanation:
A =
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The simplest way to think of this is a ratio. In the original 7 cards used for demonstration, 4 are blue. You can write it like this:
Since there are 84 total cards, and you need to find how many total blue cards there are, you can compare the total of the sample to the complete total, and then solve for an x value of total blue cards.
= 
You can solve using cross multiplication. 84*4=336. 7*x=336.
x=48
Since there are 84 total cards, and you need to find how many total blue cards there are, you can compare the total of the sample to the complete total, and then solve for an x value of total blue cards.
You can solve using cross multiplication. 84*4=336. 7*x=336.
x=48
Answer:
The x-coordinate of the intersection of the lines is
Step-by-step explanation:
First you need to know the equation of the line that passes through the points (0,2) and (1,1).
The equation of the line in slope intercept form is y=m*x + b
By having two points, you can use them to find the slope m using the expression:
In this case (x1,y1)= (0,2) and (x2,y2)= (1,1). Replacing:
Now you can replace in the values of m, and the values of a point x and y into the equation y = mx + b to find the value of b.
1=(-1)*1 +b
So: 1=-1 +b
b=1+1
b=2
Then you have: y=-1*x +2
So you have the following system of equations:
Equating both equations you have:
-1*x+2= 3*x+3
Solving:
-1*x-3*x= 3-2
-4*x= 1
<u><em>The x-coordinate of the intersection of the lines is </em></u><u><em></em></u>