Algebra-1

First this function must be y = kx + b cause it is a linear function. By observing its intersections with the x and y axes, we can determine:
Through(0, 1) and (1, 0), they are 2 solutions for y = kx + b.
Put it into y = kx + b, thus we got
1 = 0*k + b
0 = k + b

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