Question

calcule o valor de x para a equação. -3x + y=20,para y = x+1

Answer 1

-3x + y=20,para y = x+1

-3x + (x+1)=20
-3x+x+1=20
-2x=19
x= -19/2

y = x+1
y = (-19/2)+1
y= (-19+2) /2
y= -17/2.

Answer 2

-3x + y=20
y = x+1

-3x + x + 1 = 20 ==> - 2x = 20-1 ==> -2x=19(-1) ==> 2x = 19 ==> x = 19/2
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y = 19 + 1 ==> 19+2 ==> 21
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