It is an equation of a straight line. But it is not possible to tell you what x and y equal because you have only given one equation. Since there are two variables (x and y), you need at least 2 equations to solve for x and y. (Likewise if you had 3 variables, you would need at least 3 equations).
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It is (-1, 3).
If x=6 and y=8, then [ 5x + 8y ] = 5(6) + 8(8) = 30 + 64 = 94
y=x+1 there for answer is 2
y = 3x 3x + 4y = 30 3x + 4(3x) = 30 3x + 12x = 30 15x = 30 x = 2 y = 3x y = 3(2) y = 6 (2, 6)
It's an inconsistent pair of equations, for which there is no solution.