Question

Malik’s solution to the equation , when , is shown below.

What error did Malik make first when solving the equation ?

Answer 1

D 60 for x

Explanation:

Answer 2

Malik substituted 60 for y instead of x

Explanation:

The complete question is

Malik’s solution to the equation ,2/5x-4y=10 when x=60, is shown below.what error did Malik make first when solving the equation ?

Options are

malik did not multiply correctly. malik added 240 to each side of the equation. malik did not multiply correctly. malik substituted 60 for y instead of x

Malik’s solution is

`(2)/(5)x-4(60)=10\\(2)/(5)x=10+240\\(2)/(5)x=250\\x=625`

we have

`(2)/(5)x-4y=10`

For x=60

substitute the value of x in the equation and solve for y

`(2)/(5)(60)-4y=10`

`24-4y=10`

`4y=24-10`

`4y=14`

`y=(14)/(4)\\\\ y=(7)/(2)`

therefore

Malik substituted 60 for y instead of x