Question

−4x+11y=15 ​x=2y ​​

Answer 1

Use substitution to solve the equation. Replace x in the first equation with 2y then follow procedures to find. 
-4(2y) +11y = 15
-8y + 11y = 15
3y = 15
y=5
Then, replace in the first equation your answer of y (y= 5) in the equation and solve to find x.
-4x + 11(5) = 15
-4x + 55 = 15
-4x = -40
x= 10
Your answer is (10,5)

Answer 2

Hello

-4x + 11y = 15
x = 2y

Ok, we need to solve x = 2y for x
Lets start by substitute 2y for x in -4x + 11y = 15
-4x + 11y = 15
-4(2y) + 11y = 15
-8y + 11y = 15
3y = 15
Divide both sides by 3
3y/3 = 15/3
Y = 5

Again, substitute 5 for y in x= 2y
x = 2y
x = 2(5)
x = 10

Final answer : X = 10 and y = 5

Good luck!