Your equation does not have an x variable. So as-is would be a horizontal line (no x-intercept). If this was a typo and you meant to have x in one of the terms then it would have an x and y intercept.
The y intercept is where it intersects the y-axis. The x coordinate of the y-axis is x=0, so substitute x=0 into the equation, and solve for y.
To find the x-intercept, substitute y=0, and solve for x.
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It is the property that equals plus equals are equals.
2048
Instead of -25 plus - 16, think of it as -25 - 16. 25 mins 16 equals -41.
8
84 + 16 = 100