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7x - y = 0 → 7x = y (add y to both sides).
You now have y = 7x where y is a function of x. For a few values of x, workout what y is and plot those points. You should see a pattern to those points and be able to join them up in the right way.
(Hint, y = 7x is a linear equation, so expect a straight line between all the points.)
If the equation is 7x - 3y = 21 then (3, 0) and (0, -7).
x2+7x+12=0 x2+7x=-12 x+Sqaure Root of 7x= 2(SQ Root Symbol)3
7x2-10x+3=0 (7x-3)(x-1)=0
7x + 2 = 6x + 2 if and only x = 0.
x2 + 7x + 9 = 3 ∴ x2 + 7x + 6 = 0 ∴ (x + 6)(x + 1) = 0 ∴ x ∈ {-6, -1}