Question

how to solve -x+2/7=2x+86/7

Answer 1

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Answer 2

-3x=84/7
-3x=12
x=-4

Answer 3

-3x=84/7
-3x=12
x=-4

Answer 4

This is setting two equations equal to each other to find the point where their lines intersect each other. They're both in y=mx+b form, so you just have to solve the equation algebraically

-X+2/7=2X+86/7
-X+X+2/7=2X+X+86/7
2/7=3X+86/7
2/7-86/7=3X+86/7-86/7
-84/7=3X
-12=3X
-12=3X
--- ---
3 3
-4=X

When you have your X-value for the point, you can plug it into either of the two equations you started with and solve for Y:
y=-x+2/7
y=2x+86/7
Now you have your coordinate!