You add two equations together to eliminate a variable. This particular problem is nice, because it's already setup to eliminate X.
3x - 4y = 9
<span>-3x + 2y = 9
</span>
When we add these two together, 3x - 3x cancels each other out, leaving us with 0x, or nothing.
We continue with -4y + 2y (leaves us with -2y) and 9+9 (18).
-2y = 18
18/-2 = -9.
Now we have y = -9, and we can go back into the problems to solve for x.
<span>3x - 4(-9) = 9
</span>
3x + 36 = 9.
3x = -27
x = -9.
Confirm with the final equation:
-3(-9) + 2(-9) = 9
27 - 18 = 9
9 = 9 --- Confirmed.
Take 17100 divide by 100 the answer you get is the number of seats for 1% so to get 62%, multiply 17100/100 X 62 <span>the answer is certainly 45,000</span>
Probability always adds up to 1 so, if there is only one choice, the chance that it will happen is 100% (1 out of 1) so true
Hope this helps! :)
