Answer:
The first equation must be multiplied by -5 to eliminate x variable by addition
Step-by-step explanation:
4 x - 3 y = 1 (1)
5 x + 4 y = 9 (2)
If the second equation is multiplied by 4
5x+4y=9. ×4
We have,
20x+16y=36 (3)
The first equation should be multiplied by -5 to eliminate x variable by addition
4x-3y=1 × -5
We have
-20x+15y=-5 (4)
Add equation (3) and (4) to eliminate x variable
20x+16y=36
-20x+15y=-5
31y=31
Divide both sides by 31
y=1
Substitute y=1 into equation (1)
4 x - 3 y = 1
4x-3(1)=1
4x-3=1
4x=1+3
4x=4
Divide both sides by 4
x=1
the cost for each of jelly beans and each pound of trail mix is $2.5 and $1.75
<u>Step-by-step explanation:</u>
Given A store is having a sale on jelly beans and trail mix. For 3 pounds of jelly beans and 2 pounds of trail mix, the total cost is $11. For 5 pounds of jelly beans and 6 pounds of trail mix, the total cost is $23 . We have to find the cost for each pound of trail mix and each pound of jelly beans.
Let the cost of each pound of trail mix is $y.
and the cost of each pound of jelly beans is $x.
According to question,
For 3 pounds of jelly beans and 2 pounds of trail mix, the total cost is $11.
⇒
→ (1)
For 5 pounds of jelly beans and 6 pounds of trail mix, the total cost is $23
⇒
→ (2)
Solving (1) and (2), we get
3(1 equation)-(2 equation)=0
⇒![3(3x+2y)-5x-6y=3(11)-23](https://tex.z-dn.net/?f=3%283x%2B2y%29-5x-6y%3D3%2811%29-23)
⇒![9x+6y-5x-6y=10](https://tex.z-dn.net/?f=9x%2B6y-5x-6y%3D10)
hence,
⇒![4x=10](https://tex.z-dn.net/?f=4x%3D10)
⇒![x=2.5](https://tex.z-dn.net/?f=x%3D2.5)
Putting
in
we get ;
⇒
⇒ ![3(2.5)+2y=11](https://tex.z-dn.net/?f=3%282.5%29%2B2y%3D11)
⇒ ![2y=11-7.5=3.5](https://tex.z-dn.net/?f=2y%3D11-7.5%3D3.5)
⇒ ![y=1.75](https://tex.z-dn.net/?f=y%3D1.75)
Hence, the cost for each of jelly beans and each pound of trail mix is $2.5 and $1.75 .
The equation is
(A ≠ B)
A is the first number, ratio, rate, etc. , and B is the second.
The ≠ symbol means "does not equal", so the equation means:
[ Ratio A is NOT equal to Ratio B. ]