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3 years ago

Solve the simultaneous equations

Mathematics

2 answers:

Karo-lina-s [1.5K]3 years ago

6 0

Answer:

x=9/2

y= -3/2

Step-by-step explanation:

espero que te sirva:)

hram777 [196]3 years ago

3 0

Answer:

5x+y=21......equation 1

x-3y=9......equation 2

from1:y=21-5x.....equation 3

substitute y by 21-5x in equation 2

x-3(21-5x)=9

x-63+15x=9

x+15x=9+63

16x=72(we divide both sides by 16)

16÷16=72÷16

therefore x=9/2 or x=4,5

substitute x by 4,5 or 9/2 in equation 3

y=21-5(9/2) or y=21-5(4,5)

y=-3/2 or y=-3/2

prove

5(9/2)-3/2=21

-3/2-3(9/2)=9

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