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I have no idea how to solve this problem. Can someone help me???

3x+3y=-6(this is a negative 6)
7x+4y= 1

3x+3y=-6
3y=-6-3x Divide with 3
y=-2-x

7x+4y=1
7x+4*(-2-x)=1
7x-8-4x=1
3x-8=1
3x=1+8
3x=9 Divide with 3
x=9/3
x=3

y=-2-x
y=-2-3
y=-5

x=3 y=-5

Cheking of results:
3x+3y=3*3+3*(-5)=9-15=-6

7x+4y=7*3+4*(-5)=21-20=1

which is a table of value for y=x-12

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