y = -x + 2
The graph is a straight line, with [slope = -1], and passing through the point [y=2] on the y-axis.
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y = 2x + 1 IS a linear equation!
The question contains an expression, not an equation. An expression does not have a graph. Furthermore, even if it were an equation, its form suggests that it would be a linear equation and a linear equation does not open in any direction.
Assuming that the 2 in "5x2" is a power (5x2), then no, this is not a linear equation. It is a parabolic equation.
-2x plus 3y equals 1
Yes, it is a linear straight line equation.