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mixer [17]
3 years ago
8

What is the solution to the system of linear equations?

Mathematics
1 answer:
Dmitry_Shevchenko [17]3 years ago
4 0

Answer:

x = 5, y = -1/2

Step-by-step explanation:

3.5x - 5y = 20

3x + 4y = 13 multiply by 1.25 so the y's match up (you could match x's too)

3.75x + 5y = 16.25

–––––––––––––––––––––––

3.5x - 5y = 20

3.75x +5y = 16.25

7.25x + 0y = 36.25 you can add or subtract here (on this equation you add)

7.25x=36.25

x=5 So now we have x=5 and to find y we can just plug in x into one of the equations

–––––––––––––––––––

3(5) + 4y = 13

15 + 4y = 13

4y = -2

y = -1/2

x = 5, y = -1/2

Then you can plug in both to check your answers.

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A billboard is 2.5 times as long as it is wide.The area of the billboard is 2,250 ft.A scale drawing is made of the billboard,an
GaryK [48]
Width = w
Length = 2.5w

Area of Rectangle: Width × Length
w (2.5w) = 2250
2.5w^2 = 2250
w^2 = 2250/2.5 = 900
w = Sq rt of 900 = 30
l = 75

Ratio of inches to ft
x/30 = 160/2250
cross multiply: 2250x = 160 × 30
2250x = 4800
x = 4800/2250 = 2.13333...

length
x/75=160/2250
2250x = 75(160)
2250x = 12,000
x= 12,000/2250
x = 5.3333...

scale is 2.13" × 5.33"
3 0
4 years ago
Read 2 more answers
Evaluate the expression. If necessary, round to the nearest hundredth. ln 0
STatiana [176]
Well, a logarithmic expression is just an exponential expression written from the point of the exponent.

now, ln is just a shorthand for the logarithm with a base "e" or euler's constant, so-called the "natural logarithm", now, let's use the exponential version of that here, and let's say equals an constant exponent of "k",

\bf \textit{exponential form of a logarithm}\\\\
log_{{  a}}{{  b}}=y \implies {{  a}}^y={{  b}}\qquad\qquad 
%  exponential notation 2nd form
{{  a}}^y={{  b}}\implies log_{{  a}}{{  b}}=y\\\\
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ln(0)=k\implies log_e(0)=k\implies e^k=0

now, look closely, what "k" value, what exponent, negative or fraction or positive, will ever make "e" to 0?  none, so one can say is "undefined".
7 0
3 years ago
PLEASE HELP I WILL MAKE YOU BRAINLIEST IF IT LETS ME<br><br> NO FAKE LINKS OR YOU WILL BE REPORTED
Kaylis [27]

Answer:

The top left graph

Step-by-step explanation:

All the others are wrong

4 0
3 years ago
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Solve for x: <br> (125^2x)(5x) = 25^3
olga nikolaevna [1]
(125^2x)(5x) = 25^3
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Hope I helped ;D
6 0
3 years ago
I need helppppp........
grin007 [14]

Answer:

B

Step-by-step explanation:

To do this, you need to complete the square.

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Therefore, the correct answer is choice B. Hope this helps!

7 0
4 years ago
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