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Nookie1986 [14]
3 years ago
10

X + y = 3 2x + 2y = -4​

Mathematics
2 answers:
Rasek [7]3 years ago
4 0

Answer:

Step-by-step explanation:

no solutions

2x+2y=-4 divide 2

x+y=-2

x+y=3

zaharov [31]3 years ago
3 0

Answer:

(x,y)= (2/15, -(62/15)

Step-by-step explanation:

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Find constants a and b such that the function y = a sin(x) + b cos(x) satisfies the differential equation y'' + y' − 7y = sin(x)
Elza [17]
The first thing we must do in this case is find the derivatives:
 y = a sin (x) + b cos (x)
 y '= a cos (x) - b sin (x)
 y '' = -a sin (x) - b cos (x)
 Substituting the values:
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 We rewrite:
 (-a sin (x) - b cos (x)) + (a cos (x) - b sin (x)) - 7 (a sin (x) + b cos (x)) = sin (x)
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 sin (x) * (- b-8a) + cos (x) * (a-8b) = sin (x)
 From here we get the system:
 -b-8a = 1
 a-8b = 0
 Whose solution is:
 a = -8 / 65
 b = -1 / 65
 Answer:
 
constants a and b are:
 
a = -8 / 65
 
b = -1 / 65
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