HOW DO I DO THIS AND WHERE CAN I LEARN MORE

23in

Step-by-step explanation:

The total value is 31, so all you need to do is subtract the other part of the equation from the whole which would give you 23 inches. If you want to learn more got sites like math is fun or quizlet. I suggest this because they explain questions like this in a raaay easy way.

if y=4x then you will substitute 4x in for y in the second equation.

8x + 4x = 18 combine like terms

12x = 18 divide by 12 on both sides

x = 18/12 or 3/2

now replace x in the first equation with 3/2 to get

y = 4 3/2

y = 6

the answer is a

(3/2,6)

hope that .

brainliest is always apprectiated