Posted by jasort120 on .
i need help solving the system by addition.
5x7y=5
x+3y=1
this is what i think but i am not sure
3y=x+1
y= (1/3)x+(1/3)
5x  7 (1/3x + 1/3) = 5
5x+2.3333331x2.3333331=5
7.3333331x2.3333331=5
7.3333331x=7.3333331
x=1
x+3y=1
1+3y=1
3y=11
3y=0
y=0
so my solutions i get is
x = 1 and y = 0
You have the solution ,but you did not get it by addition.
5x7y=5
x+3y=1
Multiply the second equation by 5
5x7y=5
5x15y=5
Now add the equations.
0x  22y= 0
solve, y=0
5x7y=5
x+3y=1
Put y=0 into either equation, and solve for x.

mATH, ALGEBRA 
Anonymous,
{5x3y=11
{3x+y=1