Question

3x + y = 9, y = 2x + 4
Solve by substitution!
Just explain how to get y!! please ty

Answer 1

`\huge\mathrm{Answer࿐}`

The given equations are :

• 3x + y = 9 - [1]

• y = 2x + 4 -[2]

Plug the value of y from equation [2] into equation [1]

• 3x + y = 9

• 3x + 2x + 4 = 9

• 5x = 9 - 4

• x = 5 ÷ 5

• x = 1

Now, plug value of x in equation [2]

• y = 2x + 4

• y = (2 × 1) + 4

• y = 2 + 4

• y = 6

_____________________________

`\mathrm{ \#TeeNForeveR}`

Answer 2

Explanation:

3x+y=9…... eqn 1

y=9-3x

y=2x+4.... eqn 2

substituting value of y from eqn 1 in eqn 2

• y=2x+4
• 9-3x=2x+4
• 9-4=2x+3x
• 5=5x
• x=1

again substituting value of x in eqn 2

• y=2x+4
• y=2×1+4
• y=6

hope it helps.

stay safe healthy and happy.