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X = 12
x = +13x = - 13
x2 + 13x = -30 ∴ x2 + 13x + 30 = 0 ∴ (x + 3)(x + 10) = 0 ∴ x ∈ {-3, -10}
x2-13x+36=(x-9)(x-4)=0 x=9 or x=4
The equation y = 13x is in the form "y = mx + b" (in this case, b is zero). Therefore, the equation is linear.