Question 62276
how do i solve the system by graphing:

E1:  x + y = 4
E2:  y = 2x + 1
For E1, let x=0 and y=?
0+y=4
y=4  Plot (0,4)
Now let y=0 and x=?
x+0=4
x=4  Plot (4,0)
Connect the points and you have this line:
{{{graph(300,200,-10,10,-10,10,-x+4)}}}
For E2, let x=0 and y=?
y=2(0)+1
y=0+1
y=1  Plot (0,1)
Now let x=2 and y=?
y=2(2)+1
y=4+1
y=5  Plot (0,5)
Connect the points and you have a second line:
{{{graph(300,200,-10,10,-10,10,-x+4,2x+1)}}}
Their point of intersection is the solution: (x,y)=(1,3)
Happy Calculating!!!