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a)
{ 0 = 0*a + b
{ 4 = 1*a + b
{ b =0
{ 4 = a + b
{b =0
{a = 4
y=4x + 0
y = 4x
b)
a = tgα
a=tg30°
a = √3 / 3
y = √3 / 3 x + b
0 = √3 / 3 * 0 + b
b = 0
y = √3 / 3 x