Y=2x+1 x+y=7 pls help meeeeeeeee

Mathematics

2 answers:

Gala2k [10]3 years ago

5 0

Answer:

$y=2,\:x=\frac{5}{2}$

Step-by-step explanation:

$\begin{bmatrix}x+1\cdot \:x+y=7\\ y=2\end{bmatrix}$

x+1· x+2=7

Simplify x+1· x+2: 2x+2x+1· x+2

Add similar elements: x+1· x=2x=2x+2

2x+2=7[ 2x+2=7 ]

Isolate x for 2x+2=7: x=52 2x+2=7

Subtract 2 from both sides

2x+2−2=7−2

Simplify

2x=5

Divide both sides by 2

2x2 =52 Simplify

vlabodo [156]3 years ago

4 0

Answer:

$y = 2x + 1 \\ substitute \: for \: y \: in \: x + y = 7 \\ x + (2x + 1) = 7 \\ 3x = - 6 \\ x = - \frac{1}{2} \\ y = 2( - \frac{1}{2} ) + 1 \\ y = - 1 + 1 \\ y = 0$

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A plumbers plastic pipe is 4 m long, has an inside diameter of 4.0 cm and an outside diameter of 5.0cm. What is the volume of th

SCORPION-xisa [38]

Answer: $V=0.0028278\ m^3$

Step-by-step explanation:

Given

Length of the pipe $l=4\ m$

Inside diameter of the pipe $d_i=4\ cm$

Outside diameter of the pipe $d_o=5\ cm$

Volume of the pipe

$\Rightarrow V=\dfrac{\pi }{4}[d_o^2-d_i^2]\\\\\text{Insert the values}\\\\\Rightarrow V=\dfrac{\pi}{4}[5^2-4^2]\times 10^{-4}\times 4\\\\\Rightarrow V=28.278\times 10^{-4}\ m^3\\\\\Rightarrow V=0.0028278\ m^3$