Question

y=2x+6, 2y - 4x = 20
Solve it substitution method

Answer 1

Answer:

2(2x+6)-4x=20

4x+12-4x=20

0x=8

x=0

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

by substitution method

y=2x+6.................(1)

2y-4x=20..............(2)

then,.

in eqn (2)

2y=20+4x

y=20+4x/2.........(3)

the eqn (3) put in eqn(1)

y=2x+6

20+4x/2=2x+6

20+4x=2(2x+6)

20+4x=4x+12

20-12=4x-4x

4x-4x=8

4x=8+4x

x=8+4x/4

x=2+4x

-2=4x-x

-2=3x

x=-2/3.…......(4)

the eqn 4 put in eqn 2

2y-4(-2/3)=20

2y+8/3=20

2y=20/1-8/3

2y=60-8/3

2y=20-8

y=12/2

y=6

so,we find the value of both x=-2/3 &y=6.