Let's actually find the sol'n set.
<span>Line A: 2x + 2y = 8
Line B: x + y = 4
becomes
</span><span> 2x + 2y = 8
x + y = 4
------------------ Multiply the 2nd equation by -2, obtaining -2x - 2y = -8,
and then add your result to the first equation:
</span> 2x + 2y = 8
-2x - 2y = -8
------------------- Combine all 3 columns.
0 + 0 = 0
0 always = 0, so there are infinitely many solutions to this system.

According to given information,
a.) Initial cost of renting car (y - intercept (b)) = the total cost when the distance travelled = 0
that is :
b.) rate of change = slope
- blank - 2 :

c.) Let's
and according to above data :
so, the required equation is :
put this equation in blank - 3 ~
Answer: First side is 40.5 meters. Second side is 121.5 meters. The third side is 159.
Step-by-step explanation:
x + 3x + 4x -3 = 321
8x - 3 =321
+3 +3
8x = 324
x = 40.5
Second Side: 3(40.5) = 121.5
Third side: 4(40.5) - 3 = 159
Check: 159 + 121.5 + 40.5 = 321