Answer:
y= 
Step-by-step explanation:
2x+3y=C
isolate y
3y=C-2x
y= 
If the answer can be left in a fraction than this is the solution: 2×5/8=5/4
5/4-1/3=11/12
if you mean the answer must be left in a whole number than.. I don't really know how to do it
“a” would equal 7!! hope this helps :)
#4 has the same y intercept
If you put the equations in y = mx + b you will see that it has a y intercept of -3