That x-intercept is where the line passes through the x axis (the horizontal line) and the y-intercept is where the the line passes through the y axis (the vertical line).
The slope is kind of like how slanted the line is. The slope is 2 because for every 1 point the goes horizontally, it goes 2 points vertically.
In case you have np idea what on earth I just said the answer is 2.
Answer:
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<span>Across nearly seven million years, the human brain has tripled in size, with most of this growth occurring in the past two million years.</span>