I won't answer them all for you (don't want to cheat - need to learn something).
But for the first one given:
<span>-2x-9y=-25
-4x-9y=-23
you set up either x or y (which ever one you want to eliminate) so that one of them cancels.
So this one is easy - you just have to multiply an entire row by negative (doesn't matter which one) - so that the y's will be + and -
Since they're both 9 and they're subracting NOW - you can eliminate the y value. Now add/subtract the x's. So it'd be -2 or 2 depending on how you eliminated y. Then add the number outside of the = sign. Now just solve for x. After that plug in whatever you got for x into both of the rows. Then find the y value.
Hopefully this wasn't confusing -- reply if it is and I will try to simplify. I can give you contact if you need help with the rest
Good luck!</span>
Answer:
According to my equation it's 20°
I think the rate is decreasing from:
(-infinity, ln9/3)
Answer:
7 decimal digits
Step-by-step explanation:
Because it ws rounded up to 0.6289731
and the known digits after the decimal are 7 in numbers.
0.6290 ......4 decimal digits
0.62897..... 5 decimal digits
0.628973.... 6 decimal digits
0.628973 ..... 7 decimal digits
