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ICE Princess25 [194]
3 years ago
12

Please help me with this one 10x+5y=72 15x+4y=80

Mathematics
2 answers:
Andre45 [30]3 years ago
7 0
I hope this helps you

Mariulka [41]3 years ago
6 0
Problem: Solve 10x+5y=72;15x+4y=80 Steps: I will try to solve your system of equations. 10x+5y=72;15x+4y=80 Step: Solve10x+5y=72for x: 10x+5y+−5y=72+−5y(Add -5y to both sides) 10x=−5y+72 10x 10 = −5y+72 10 (Divide both sides by 10) x= −1/2 y+36 5 Step: Substitute −1 2 y+ 36 5 forxin15x+4y=80: 15x+4y=80 15( −1 2 y+ 36 5 )+4y=80 −7 2 y+108=80(Simplify both sides of the equation) −7 2 y+108+−108=80+−108(Add -108 to both sides) −7 2 y=−28 −7 2 y −7 2 = −28 −7 2 (Divide both sides by (-7)/2) y=8 Step: Substitute8foryinx= −1 2 y+ 36 5 : x= −1 2 y+ 36 5 x= −1 2 (8)+ 36 5 x= 16 5 (Simplify both sides of the equation) Answer: x=16/5 and y=8
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6x + 7y = 1<br> 8x – 3y = 25<br> Solve me fast explainly
Elenna [48]

Answer:

{x,y} = {89/37,-71/37}

Step-by-step explanation:

 8x = 3y + 25

 [2]    x = 3y/8 + 25/8

Plug this in for variable  x  in equation [1]

  [1]    6•(3y/8+25/8) + 7y = 1

  [1]    37y/4 = -71/4

  [1]    37y = -71

Solve equation [1] for the variable  y  

  [1]    37y = - 71

  [1]    y = - 71/37

By now we know this much :

   x = 3y/8+25/8

   y = -71/37

Use the  y  value to solve for  x  

   x = (3/8)(-71/37)+25/8 = 89/37

5 0
2 years ago
Whats the answer for this <br> 4b²+20b+25
WITCHER [35]
4b²+20b+25=0

Divide everything by 4 

b²+5b+ 6.25=0 

use the quadratic formula 
x= (-b+ or - √b²-4ac) /2a
x= (-5 + or - √5²-4*1*6.25) /2(1)
x= -5/2 so
in this case, b= -5/2

7 0
3 years ago
Please help 30 points and brainly answer :(
Tasya [4]

The graphs insect at 3 and 13

4 0
3 years ago
What is the value of this expression -15-(-4)+17
Doss [256]

\sf\implies \:  - 15 - ( - 4) + 17

\sf \implies \:  - 15 + 4 + 17

\sf \implies \:  - 15 + 21

\boxed{ \tt \: ans \dashrightarrow 6}

<h3>Remember these laws of integers:</h3>

  • (+)(-)=(-)
  • (-)(+)=(-)
  • (-)(-)=(+)
  • (+)(+)=(+)

7 0
2 years ago
Read 2 more answers
Does anyone know what lesson this is i took these notes are they good
Nezavi [6.7K]

Answer:

ngl i learned this type of math pretty sure, and that looks better than my teachers own notes-

Step-by-step explanation:

ima go poof again cuz if i don't ima lose my game ;-;

7 0
2 years ago
Read 2 more answers
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