Answer:
Step-by-step explanation:
Let x represent the number of stamps from Europe.
Let y represent the number of stamps from Africa.
Let z represent the number of stamps from Asia.
She has 47 stamps in all. This means that
x + y + z = 47 - - - - - - - - - - - 1
The number of African stamps is 2 times the number of Asian stamps. This means that
y = 2z
She has 20 stamps from Europe. Therefore, substituting x = 20 and y = 2z into equation 1, it becomes
20 + 2z + z = 47
3z = 47 - 20 = 27
z = 27/3 = 9
y = 2z = 2 × 9
y = 18
She has 20 stamps from Europe, 18 stamps from Africa and 9 stamps Asia.
The solution is where the two lines cross each other which is (2.3, 4.1)
To graph the lines replace x with a number and solve for y, so this at least twice for each equation. This will give you points to use to draw the lines.
Answer:
1. A
2. B
3. D
The square root of 28 is equivalent to 2 x the square root of 7
the square root of 252 is equivalent to 6 x the square root of 7
the square root of 36 is 6
Answer:
84
Step-by-step explanation:
72/x = 6/7
muliply by x on both sides
72 = 6/7x
mulitply by 7 on both sides
504 = 6x
divide by 6 on both sides
84
C 64 I hope I help you out
