Answer:
Step-by-step explanation:
x+y=10
x=10-y
x=10-5
x=5
3y= -3x+30
3(10-y)= -3(10-y)+30
30-3y= -30+3y+30
30+30-30=6y
30=6y
y=5
Answer:
Let a and b integers and suppose that are even numbers. Then, exist integers k and m such that 
and 
.
Then,
Since, k and m are integers then n=k+m is an integer. Then, since a + b is of the form 2 by an integer n, then a + b is an even number.
Answer:
C. Commutative Property.
Step-by-step explanation:
All they are doing is changing the order in which the problem is, and that's the definition of Commutative Property.
Answer:
y= -3.5x+57.5.
Step-by-step explanation:
Answer:
275
Step-by-step explanation:
Cross multiply
36% of the boys = 99
100% of the boys = x
36/100 = 99/x ===> 36x = 99*100 ===> 36x = 9900 ===> x = 9900/36 ===>
x = 275 boys
