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2 years ago

Solve: 2x+4y=20 and 2x-y=4

Mathematics

2 answers:

Masteriza [31]2 years ago

5 0

Answer:

X=3.6

Y=3.2

Step-by-step explanation:

2x-y=4 which means 2x=4+y
2x+4y = 20 which means 4+y+4y=20 ==> 4+5y=20
5y = 20-4 = 16
y= 16/5 = 3.2
2x=4+y=4+3.2=7.2
x = 7.2/2 = 3.6

fgiga [73]2 years ago

4 0

Answer:
(x, y) = (18/5, 16/5)
OR
(x, y) = (3.6, 3.2)

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2 years ago

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2 years ago

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2 years ago

A runner runs around a circular track. He completes one lap at a time of t = 269 s at a constant speed of v = 4.6 m/s. What is t

AURORKA [14]

Answer:

$\boxed{\text{197 m}}$

Step-by-step explanation:

The formula relating distance (d), speed (s), and time (t) is

d = st

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2.Calculate the track radius

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$\begin{array}{rcl}C & = & 2 \pi r\\1240 & = & 2 \pi r\\\\r & = & \dfrac{1240}{2 \pi }\\\\& = & 197\\\end{array}\\\text{The radius of the track is }\boxed{\textbf{197 m}}$

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3 years ago

Pls help need answer ASAP

kirza4 [7]

Answer:

y =5^x

y=78,125

if we have x=7

y=5^7

5×5×5×5×5×5×5=78,125

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2 years ago