Algebra-1

First this function must be y = kx + b cause it is a linear function. By observing their intersections with the x and y axes, we can determine:
Through(0, -3) and (3, -1), they are 2 solutions for y = kx + b.
Put it into y = kx + b, thus we got
-3 = 0*k + b
-1 = 3k + b
Through the first equation we got b = -3
Put b = -3 into -1 = 3k + b we got
k =

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