Question

Solve these system of linear equations:

1. {2x+4y=12
    {2x+8y=24

2. {5x-10y=30
    {3x-y=20

3. {x-6y=12
    {3x-y=20

With Steps Please!

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Answer 1

1.solve for y
2x+4y=12
-2x -2x
4y=12-2x
4 4
y=3-1/2x

step2 plug in y and solve for x
2x+8y=24
2x+8(3-1/2x)= 24
2x+24-4x=24
-2x=0
-2 -2
x=0
last step plug in x and solve for y

y=3-1/2x(0)
y=3