Question

Which equation is shown on the graph?  

    A. y = 2x

   
B. y = x + 2    
C. y = 2x + 2    
D. y = x – 2

Answer 1

`y=mx+b\\\\A(0;\ 2);\ B(-2;\ 0)\\\\for\ x=2\to y=2\\\\substitute:m\cdot0+b=2\to b=2\\\\y=mx+2\\\\for\ x=-2\to y=0\\\\substitute:-2m+2=0\to-2m=-2\ \ \ /:(-2)\to m=1\\\\Answer:y=x+2\ (B)`