Answer:
Here's the simplest example possible: let's say x + y = 3 and x - y = 1. Solve the second equation for x by adding y to both sides: (x - y) + y = 1 + y. So x = 1 + y. Take that value of x, and substitute it into the first equation given above (x + y = 3).
 
        
             
        
        
        
Answer:
una
Step-by-step explanation:
4/20=.20
.20 per pencil
 hope this helps, brainliest appreciated
 
        
             
        
        
        
Answer:
Step-by-step explanation:
A, B & C lie on a straight line.
D, C & E lie on a different straight line.
Ah, this is 2 intersecting lines
angles
y
= 106° and angle
z
= 64°.
well we know that a full size of circle is 360 degrees
let's add z and y :
106+64 = 170 
then, let's subtract it from 360
360 - 170 = 90
we must devide it by 2, why? because 90 is from two section of x (2x)
so 90/2 = 45 
and there you have it x = 45
if you still cannot visualize what is intersecting line mean, then see the file below
 
        
             
        
        
        
7 games.
18×7=126
483+126=609
21×7=147
462+147=609
After 7 games each will have 609 points.
        
             
        
        
        
The 1st equation can be factored into 

you can apply the zero product rule now.