A system of equations is given below:

y = 3x + 4
2x + 3y = 10

Which of the following steps could be used to solve by substitution?

3x + 4 = 2x + 3y
2x + 3(3x + 4) = 10
2(3x + 4) + 3y = 10
3(y = 3x + 4)

Question

A system of equations is given below: 

y = 3x + 4 
2x + 3y = 10 

Which of the following steps could be used to solve by substitution?

 3x + 4 = 2x + 3y
 2x + 3(3x + 4) = 10
 2(3x + 4) + 3y = 10
 3(y = 3x + 4)

nuccioreggie · Answer

@Sushi121212

anonymous · Answer

https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-with-substitution/v/substitution-method-2

sushi121212 · Answer

Substitution is plugging in numbers with a x or y. You would have to plug in something that equals a x or y into the the x or y of the other equation:

y = 3x + 4  (Equals y, so all we have to do is plug it into the y on the bottom.)
2x + 3y = 10 
          ↑ plug in 3x+4 here for y.
 
2x+3(3x+4)=10 is your answer.