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{0 = 4a + b /*(-1)
{3 = a + b
{0 = -4a - b
{3 = a + b
--------------- +
3 = -3a /:(-3)
-1 = a
3 = -1 + b
4 = b
y = -x + 4
y=ax+b
3=a*1+b
0=a*4+b
b=3-a
0=4a+3-a
3a=-3
a=-3/3
a=-1
............
b=3-(-1)=3+1=4
y=-x+4