SOLUTION: I AM A GRANDFATHER TRYING TO HELP MY GRANDSON WITH ALGEBRA 1A. I HAVE SEVERAL PROBLEMS I NEED ASSISTANCE WITH. PLEASE BE PATIENT, I HAVENT DONE THIS IN A WHILE. THE QUESTION IS THI

Algebra ->  Finance -> SOLUTION: I AM A GRANDFATHER TRYING TO HELP MY GRANDSON WITH ALGEBRA 1A. I HAVE SEVERAL PROBLEMS I NEED ASSISTANCE WITH. PLEASE BE PATIENT, I HAVENT DONE THIS IN A WHILE. THE QUESTION IS THI      Log On


   

Question 1204866: I AM A GRANDFATHER TRYING TO HELP MY GRANDSON WITH ALGEBRA 1A. I HAVE SEVERAL PROBLEMS I NEED ASSISTANCE WITH. PLEASE BE PATIENT, I HAVENT DONE THIS IN A WHILE. THE QUESTION IS THIS Y= THE NUMBER OF 2 MM BLOCKS(Y) NEEDED FOR ANY NUMBER OF 4MM BLOCKS(X).
4MM BLOCKS ARE 0,6,7,X . 2MM BLOCKS ARE 18-2(0), 18-2(6), 18-2(7), AND ?. PLEASE SHOW WHAT TO DO .
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

the number of 2mm blocks (y) needed for any number of 4mm blocks (x)
relationship is linear
y=mx%2Bb
use given values for x and y to find m and b
given:
x|+y
0|18-2%280%29=18
6|18-2%286%29=6
7|18-2%287%29=4
x|?

use two points to find a slope : (0,18) and (6,6)
slope+m=%286-18%29%2F6-0%29=-12%2F6=-2
since we have (0,18), means y-intercept is b=18,and your equation is:
y=-2x%2B18
or
y=18-2x
so, when x value of 4mm blocks is unknown (as you can see from given data, it is x), then 2mm blocks y will be 18-2x
so answer is: 18-2(x)
4mm blocks are: 0,6,7,x
2mm blocks are: 18, 6, 4, 18-2%28x%29