math
posted by Modulus Function .
The graph of y=2x+c passes through the points (1,2) and (0,4) . Find the value of the constant c . Sketch the graph of y=2x+c .

from
2x+c = y
for the point (1,2)
2+c = 2
2+c=2 or 2c = 2
c = 0 or c = 4
for the point (0,4)
c = 4
c = 4 or c = 4
the common solution is c = 4
sketch y = 2x  4 and y = 2x + 4 and use only the part that lies above the xaxis.
the graph will be in the shape of a V with the "vertex" on the xaxis at (2,0)