Mathematics: Solve the system of equations {y= 15x+9 {y= 1/2x–20 What is the solution to the system?

Solve the system of equations {y= 15x+9 {y= 1/2x–20

Ответ:

angi17e

05.12.2021

$y = 15x +9~~~~.....(i)\\\\y = \dfrac 12 x -20~~~ ....(ii)\\\\\\\text{Substitute equation (i) in equation (ii):}\\\\15x +9 = \dfrac 12 x -20\\\\\ \implies 9 +20 = \dfrac x2 - 15 x\\\\\implies 29 = -\dfrac{29 x}2\\\\\ \implies 1 = -\dfrac x 2\\\\\implies x= -2\\\\\text{Substitute}~ x=-2~ \text{in equation (i):}\\\\y = 15(-2) +9 = -30 +9 = -21\\\\\text{Hence}~ (x,y) = (-2,-21)$

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Ответ:

geekymuin

27.11.2021

Mathematics

I'm thinking 8000ft because 800/0.10 = 8000.

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Solve the system of equations {y= 15x+9
{y= 1/2x–20

What is the solution to the system?

Ответ:

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