Please help me someone

Find the equation using the point (4,8)

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Three students each examine the system of linear equations shown. 8x + 4y = 16 8x + 2y = 8 caleb says there is exactly one solution. jeremy says there is no solution. kim says there are infinitely many solutions. which student is correct? provide mathematical reasoning to support your answer. answer in complete sentences. : d