Question 56026
y=x+5
3x-3y=-15    
First, you need to put the second equation in to slope-intercept form (y=mx+b) 
.
3x - 3y = -15
-3y = -3x - 15 (divided everything by -3)
y = x + 5    
.
1st: y = x + 5
2nd: y = x + 5

Your graph is going to be the same line. Therefore the answer is Infinite solutions. 
{{{graph(350,250,-5,6,-6,5,x+5,x+5)}}}