Question

Somebody help me :(

12x+6y=120
4x+y=30

Answer 1

x=5, y=10. (5, 10).

Explanation:

12x+6y=120

4x+y=30

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2x+y=20

4x+y=30

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y=20-2x

4x+(20-2x)=30

4x+20-2x-30

2x-30-20

2x=10

x=10/2

x=5

4(5)+y=30

20+y=30

y=30-20

y=10

Answer 2

12x+6y=120

4x+y=30

using elimination method.

12x+6y=120 -----(1) ×4

4x+y=30----------(2) ×12

48x+24y =480

-48x+12y =360

12y =120

y= 10

To get x sub. y for 10 into equation (2)

4x+y=30

4x+10=30

4x=30-10

4x=20

x=5

x=5 , y=10