hudson9020 hudson9020
  • 03-01-2018
  • Mathematics
contestada

4a + 6b = 10 2a - 4b equals 12 what does 12a equal

Respuesta :

anchitthawi
anchitthawi anchitthawi
  • 04-01-2018
4a+6b=10 ----(1)
2a-4b=12 ----(2)
(2)*2; 4a-8b=24----(3)
(1)-(3); 6b-(-8b) = 10-24
14b = -14
so b = -1
then 2a-4(-1)=12
2a+4=12
2a = 8
so a = 4
then 12a = 12*4 = 48 #
Answer Link

Otras preguntas

If x = –1 and y = 2, what is the value of the expression 2x3 – 3xy ?
write in pence the value of The 9 in £8.90
Which three ordered pairs complete the table to give solutions of the equation y = x – 5? A. (–3, –2), (0, –5), and (3, 2) B. (–3, –2), (0, –5), and (3, –2)
Which is greater? 45.678 or 456.78?
Combine like terms.9 + 18s – 7s A. 20s B. 9 + 11s C. 9 – 11s D. 20
When butter is heated it melts and when that melted butter cools and solidifies the process called
What is 6.95 to one decimal place? I know how to round to the nearest tenth but if you round this,it just goes to a whole number!
what consequences did hitler face from the league of nations
Miguel painting letters of alphabet on cubes. he will paint one letter of the alphabet on each cube. he knows that there are 26 letters in the alphabet. how man
Kevin can travel 22 and a half miles in one third hour what is his average speed in miles per hour