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3 years ago

Solve the system by substitution 2x + 10y = -32 x = -9y

Mathematics

2 answers:

kolezko [41]3 years ago

8 0

Answer:

y=4

Step-by-step explanation:

2(-9y)+10y=-32

-18y+10y=-32

-8y/-8 = -32/-8

y=4

alexgriva [62]3 years ago

8 0

Move the constant to the left - hand side and change its sign
2x+10y+32=0
Divided both sides of the equation by 2
X+5y+16=0
Solution
x+5y+16=0

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Step-by-step explanation:

$x \: and \: y \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ let \: the \: relation \: be \: k\\ x = ky \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ - ky = - x \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ ky = x \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ k = \frac{x}{y} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ k = \frac{12}{3} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ k = 4$

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