gabrien
gabrien
22-09-2017
Mathematics
contestada
Solve the system of equations. y =9x y =2x + 63
Respuesta :
Аноним
Аноним
22-09-2017
y=2x+7
y=9x+8
From (1),
x= (y-7)/2
Substituting value of x in eqn (2) we get,
y= 9.(y-7)/2 + 8
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apologiabiology
apologiabiology
22-09-2017
y=9x and
y=2x+63
subsitute 9x for y
9x=2x+63
minus 2x from both sides
9x-2x=2x-2x+63
7x+0=63
7x=63
divide both sides by 7
7x/7=63/7
(7/7)x=9
(1)x=9
x=9
sub back to find y
y=9x
y=9(9)
y=81
(x,y)
(9,81)
the solution is (9,81)
Answer Link
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