Question 507496
f(x) = y
y = 3(x-1)
x = 4
y = 3(4-1)
y = 3(3)
y = 9
f(x) = 9
f(4) = 9
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So this defines the point (x,y) = (4,9).
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The slope-intercept form of the equation is:
y = mx+b
y = 3(x-1)
y = 3x -3
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When x=0
y = -3
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That is the y-intercept
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{{{graph(500,500,-10,10,-10,10,3*x-3)}}}