Work:
4x+2y=7
Y=5x
Solve by substitution
4x+2 (5x)=7
Distribute
4x+10x=7
Add
14x=7
Divide
X=1/2
Solve for y
Y=5 (1/2)
Y=5/2
Answer: x=1/2 y=5/2
Check your work:
plug in answers
4 (1/2)+2 (5/2)=7
Distribute
2+5=7
7=7
Answer is correct
let me know your answer choices that you have
