yunaaaa11
yunaaaa11
14-01-2022
Mathematics
contestada
-4x+8y=40
-2x=y
solve by substitution
Respuesta :
Hekimo
Hekimo
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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