Question

dada a funçao -2x+4=y determine as cordenadas em cada ponto a seguir

A (-2,Y) B (4 , Y) C (x , 0 ) D (x , 15 )

Answer 1

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$\sf{y=-2x+4}\\\sf{A(-2,y)}\\\sf{y=-2\cdot(-2)+4=4+4=8}\\\sf{B(4,y)}\\\sf{y=-2\cdot4+4=-8+4=-4}\\\sf{C(x,0)}\\\sf{-2x+4=0}\\\sf{2x=4}\\\sf{x=\dfrac{4}{2}}\\\sf{x=2}\\\sf{D(x,15)}\\\sf{-2x+4=15}\\\sf{-2x=15-4}\\\sf{-2x=11\cdot(-1)}\\\sf{2x=-11}\\\sf{x=-\dfrac{11}{2}}$

$\sf{A\left(-2,8\right)}\\\sf{B(4,-4)}\\\sf{C(2,0)}\\\sf{D\left(-\dfrac{11}{2},15\right)}$