Simplify the expression 5x-4y

Question

Simplify the expression 5x-4y if we know that

b) x-y=1

Answer 1

Simplify the expression 5x-4y if we know that: x-y=1

x - y = 1 == > x = y + 1 or y = x - 1

Simplify in term of x only with: y = x - 1

5x - 4y = 5x - 4(x - 1) = 5x - 4x + 4 = x + 4 (Final Answer)

Simplify in term of y only with: x = y + 1

5x - 4y = 5(y + 1) - 4y = 5y + 5 - 4y = y + 5 (Final Answer)

Answer 2

Hi Lily S.

 

Given x - y = 1

We can set up everything in terms of x by solving for y above

x - y = 1

-y = 1 - x

y = -1 + x

y = x -1

Substitute this value for y in 5x - 4y

5x - 4(x - 1) = 5x - 4x + 4 = x + 4

So

5x - 4y simplifies to x + 4

Answer 3

x - y = 1

x = y + 1

5x - 4y

5(y + 1) - 4y

Can you simplyfy and answer?