Question 389521
1st one

x-4y=16

Since x does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting x from both sides.
-4y=-x+16

Divide each term in the equation by -4.
-(4y)/(-4)=-(x)/(-4)+(16)/(-4)

Simplify the left-hand side of the equation by canceling the common factors.
y=-(x)/(-4)+(16)/(-4)

Simplify the right-hand side of the equation by simplifying each term.
y=(x)/(4)-4


x-4y=16

Since -4y does not contain the variable to solve for, move it to the right-hand side of the equation by adding 4y to both sides.
x=4y+16




2nd  Problem

x+2y=4

Since x does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting x from both sides.
2y=-x+4

Divide each term in the equation by 2.
(2y)/(2)=-(x)/(2)+(4)/(2)

Simplify the left-hand side of the equation by canceling the common factors.
y=-(x)/(2)+(4)/(2)

Combine the numerators of all expressions that have common denominators.
y=(-x+4)/(2)


x+2y=4

Since 2y does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 2y from both sides.
x=-2y+4