Question

simultaneous equation
y - 2x = 7
4y +x=1
subsitution method ​

Answer 1

Answer:

y=7+2x......(1)put this value in 4y+x=14(7+2x)+x=128+14x+x=115x=-27x=-27/15.....(2)put this value in eqn (1)y=7+2(-27/5)y=7-54/5y=-3.8 More

Answer 2

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y-2x = 7............(1)

4y+x = 1............(2)

Now replacing y by its value in (2)

4(7+2x)+x = 1

28+8x+x = 1

28+9x = 1

9x = 1-28

9x = -27

x = 9−27

x=−3

Now y will be ;

4y + (-3) = 1

4y-3=1

4y=4

y=1