anonymous
  • anonymous
solve using substitution, show work -4x + y = 6 -5x - y = 21
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
find x in terms of y in 1st eqn. ,substitute in the 2nd eqn. and u get the value of y...equate that and u get the value of x
anonymous
  • anonymous
example?
shaik0124
  • shaik0124
|dw:1358532187958:dw|

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anonymous
  • anonymous
i am sorry, i have no idea what that says.
anonymous
  • anonymous
take 2 any equations like 2x+3y=11---(1) and 3x+5y=12----(2) .....from (1) u can find that x=(11-3y)/2...substitute this x value in eqn. (2) and solve...u'll get the value of y
shaik0124
  • shaik0124
-9x-27=0 -9x=27 x=-3 now u get y by substuting x value in any one of the equations
anonymous
  • anonymous
and then substitute that value of y in eqn (1) or (2) and get the value of x
anonymous
  • anonymous
i understabd substituting the final value, i just have to get it first. i dont know how to solve -4x + y = 6
shaik0124
  • shaik0124
what i have done is i got the value of y from 2nd equation and substituted in first so by substituting y in 1st equation u will get equation in x terms from u will get x value and substitute x value in any equation and get y
shaik0124
  • shaik0124
just add+4x on both sides then u will get y|dw:1358532633268:dw|
anonymous
  • anonymous
yeah, i got y = 6 + 4x
shaik0124
  • shaik0124
now u substitute y value in the other equation and u will get the equation in x terms ok do this
anonymous
  • anonymous
-5x + 6 + 4x
anonymous
  • anonymous
-5x + 6 + 4x = 21 -1x + 6 = 21 -1x = 15 x = -15 ?
shaik0124
  • shaik0124
no it is -5x+4x-6=21 now solve
shaik0124
  • shaik0124
|dw:1358533659839:dw|
anonymous
  • anonymous
move the 6 and 4x and the operation changes? thought i forgot something -5x + 4x - 6 = 21 -1x - 6 = 21 -1x = 26 x = -26
shaik0124
  • shaik0124
yes now answer is correct
anonymous
  • anonymous
thanks alot (:
shaik0124
  • shaik0124
now u substitute x value in any equation u will get y value
anonymous
  • anonymous
-4 (-26) + y = 6 104 + y = 6 y = 98
shaik0124
  • shaik0124
yes right answer
anonymous
  • anonymous
savior <3

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