Answer:
-1.4f - 24
Step-by-step explanation:
First combine like terms
-2.3f + 0.9f - 15 - 9
-1.4f -24
So, simplified it is
-1.4f - 24
Answer:
(x, y) = (3, 5)
Step-by-step explanation:
![5x+2y=25\\5x-y=10](https://tex.z-dn.net/?f=5x%2B2y%3D25%5C%5C5x-y%3D10)
Solving by elimination here again, there are 2 good options available. Either multiply the whole bottom equation by -1 to cancel the x, or by 2 to cancel the y. I'll do the latter:
![5x+2y=25\\\\2(5x-y=10)\\10x-2y=20](https://tex.z-dn.net/?f=5x%2B2y%3D25%5C%5C%5C%5C2%285x-y%3D10%29%5C%5C10x-2y%3D20)
Add from top to bottom:
![\rightarrow (5x+10x)+(2y-2y)=25+20\\\rightarrow 15x=45\\\rightarrow x=3](https://tex.z-dn.net/?f=%5Crightarrow%20%285x%2B10x%29%2B%282y-2y%29%3D25%2B20%5C%5C%5Crightarrow%2015x%3D45%5C%5C%5Crightarrow%20x%3D3)
Now, with the value of x, solve for y in either of the equations. I'll choose the second one here:
![\rightarrow 5x-y=10\\\rightarrow 5(3)-y=10\\\rightarrow 15-y=10\\\rightarrow -y=-5\\\rightarrow y=5](https://tex.z-dn.net/?f=%5Crightarrow%205x-y%3D10%5C%5C%5Crightarrow%205%283%29-y%3D10%5C%5C%5Crightarrow%2015-y%3D10%5C%5C%5Crightarrow%20-y%3D-5%5C%5C%5Crightarrow%20y%3D5)
(x, y) = (3, 5)
Answer:
3/5=x/z
Step-by-step explanation:
7x=3y
7(3)=3(7)
21=21
5y=7z
5(7)=7z (plug in the seven from the first step)
35=7z
then divide both sides by 7
5=z
therefore, X/Z=3/5