phury
solve using substitution, show work
-4x + y = 6
-5x - y = 21
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KAOS|abdullah
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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
phury
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example?
shaik0124
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|dw:1358532187958:dw|
phury
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i am sorry, i have no idea what that says.
KAOS|abdullah
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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
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-9x-27=0
-9x=27
x=-3
now u get y by substuting x value in any one of the equations
KAOS|abdullah
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and then substitute that value of y in eqn (1) or (2) and get the value of x
phury
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i understabd substituting the final value, i just have to get it first. i dont know how to solve
-4x + y = 6
shaik0124
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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
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just add+4x on both sides then u will get y|dw:1358532633268:dw|
phury
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yeah, i got y = 6 + 4x
shaik0124
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now u substitute y value in the other equation and u will get the equation in x terms ok do this
phury
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-5x + 6 + 4x
phury
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-5x + 6 + 4x = 21
-1x + 6 = 21
-1x = 15
x = -15 ?
shaik0124
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no it is -5x+4x-6=21 now solve
shaik0124
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|dw:1358533659839:dw|
phury
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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
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yes now answer is correct
phury
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thanks alot (:
shaik0124
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now u substitute x value in any equation u will get y value
phury
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-4 (-26) + y = 6
104 + y = 6
y = 98
shaik0124
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yes right answer
phury
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savior <3