Answer: Try C
Step-by-step explanation:
X + 2y = 1 ______×1
4x + y = 11 _____ ×2
x + 2y = 1
8x + 2y = 22
8x + 2y = 22
(-)
x + 2y = 1
_____________
7x = 21
x = 3
3 + 2y = 1
2y = 2
y = 1
i am a mathematics teacher. if anything to ask please pm me
Answer:
Part A)
1) ![k=250](https://tex.z-dn.net/?f=k%3D250)
2)
Part B)
1) ![k=7](https://tex.z-dn.net/?f=k%3D7)
2)
Step-by-step explanation:
Part 1) x and y vary inversely and x=50 when y=5 find y when x=10 what is k?
we know that
A relationship between two variables, x, and y, represent an inverse variation if it can be expressed in the form
or ![y=k/x](https://tex.z-dn.net/?f=y%3Dk%2Fx)
step 1
<u>Find the value of k</u>
x=50 when y=5
substitute the values
------>
-----> ![k=250](https://tex.z-dn.net/?f=k%3D250)
The equation is equal to
or ![y=250/x](https://tex.z-dn.net/?f=y%3D250%2Fx)
step 2
<u>Find y when x=10</u>
substitute the value of x in the equation and solve for y
Part B) x and y vary directly and x=6 when y=42 find k what is y when x=12
we know that
A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form
or ![y=kx](https://tex.z-dn.net/?f=y%3Dkx)
step 1
<u>Find the value of k</u>
x=6 when y=42
substitute the values
------>
----->
The equation is equal to
or
step 2
<u>Find y when x=12</u>
substitute the value of x in the equation and solve for y
Her hair grew 3.6 inches between the beginning of March and the beginning of June