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14-01-2022
Mathematics

contestada

-4x+8y=40
-2x=y
solve by substitution

Respuesta :

14-01-2022

Answer:

x=-20

Step-by-step explanation:

We know that y=-2x
We substitute our Y into the main equation: -4x+8(-2x)=40
Calculate: -4x-16x=40

-20x=40

Switch the values to make x positive: -40 = 20x
divide both sides by 20 to get x: -40÷20 = 20x÷20
You should be left with: x=-20

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