y=x^2-2x-19
y+4x=5

solution set system of equation is (-6,29) and ______.

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26-04-2017
Mathematics

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y=x^2-2x-19
y+4x=5

solution set system of equation is (-6,29) and ______.

Respuesta :

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ghanami ghanami · Answer 1 · 2017-04-29T17:09:42+02:00

ghanami ghanami

29-04-2017

hello :
Y=x²-2x-19 ...(1)
y+4x=5.....(2)
by (2) : y = 5-4x ....(*)
subsct in (1) : 5-4x=x²-2x-19
x²+2x-24 =0
Δ = 2²-4(1)(-24) = 100=10²
x1 = (-2-10)/2 =-6
x2= (-2+10)/2=4
if : x =-6 by(*) : y= 5-4(-6)=29
if x= 4 y = 5-4(4)=-11
solution set system of equation is (-6,29) and (4,-11)______.

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y=x^2-2x-19 y+4x=5 solution set system of equation is (-6,29) and ______.

Respuesta :

Otras preguntas

y=x^2-2x-19
y+4x=5

solution set system of equation is (-6,29) and ______.