For the following system, use the second equation to make a substitution for x in the first equation.

x + 3y = 5

x + 7 = 2y

What is the resulting equation?

2y+ 2x+ 3y= 5
2y+ 7 + 3y= 5
2y- 7 + 3y= 5

Question

For the following system, use the second equation to make a substitution for x in the first equation.

x + 3y = 5

x + 7 = 2y

What is the resulting equation?

2y+ 2x+ 3y= 5
2y+ 7 + 3y= 5
2y- 7 + 3y= 5

uri · Answer

I'm too lazy to do it.

uri · Answer

But no problem,she will help you @xoya.

anonymous · Answer

The last option 
because when we substitute it it becomes x + 7 = 2y===>  x=2y-7
So when we put the value of x in equation so it becomes
x + 3y = 5 ====>   2y-7+3y=5 
Got it? :)