20% of 60 is 12
60/300 = 20%
The friend is incorrect because that is 20% of 300 not 60
Answer:
Below in bold.
Step-by-step explanation:
Let x be George's age and y be Genemy's age.
x/y = 5/7
(x + 4)/ (y + 4) = 3/4
From equation 1, y = 7x/5 = 1.4x so substituting in equation 2 :
(x + 4)/ (1.4x + 4) = 3/4
3(1.4x + 4) = 4(x + 4)
4.2x + 12 = 4x + 16
0.2x = 16 -12 = 4
x = 4/0.2 = 20 = George's age.
So y = 1.4x = 1.4 * 20 = 28 = Genemy's age.
Answer:
Yes, Beyonce will get the same solution.
Step-by-step explanation:
The given system is
2x - 3y = - 2
and
4x + y = 24
If she multiplies the first equation by -2 , she gets,
-4x+6y=4
4x + y = 24
Adding the two equations gives
7y=28
This means y=4
When we put y=4 into the bottom equation we get:
4x+4=24
4x=20
x=5
Therefore Beyonce will still get x=5, and y=4 as solution.
Use demos for graphing equations
the actual graph would be a V shape