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3 years ago

9x - 3y = -42 and -9x + 8y =22

Mathematics

1 answer:

ASHA 777 [7]3 years ago

8 0

Answer:

(-5 1/9, -4)

Step-by-step explanation:

Add the equations

5y=-20

y=-4

-9x+8(-4)=22

-9x-32=22

-9x=46

x= - 5 1/9

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ElenaW [278]

Answer:

Q 12 roots of the equation

$2x^{2} -6+1=0 \\= (x-\frac{\sqrt{10} }{2})(x+\frac{\sqrt{10} }{2})\\$

∝ = $\frac{\sqrt{10} }{2}$

β = $-\frac{\sqrt{10} }{2}$

no matter if u oppose the root

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$4x^{2} -3x-4=0\\\alpha = -0.693\\\beta = 1.443$

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x1 = 1/3(-0.693) = -0.231

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3 years ago