Question

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

Answer 1

Answer:

D 60 for x

Step-by-step explanation:

Answer 2

Answer:

Malik substituted 60 for y instead of x

Step-by-step 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

$\frac{2}{5}x-4(60)=10\\\frac{2}{5}x=10+240\\\frac{2}{5}x=250\\x=625$

we have

$\frac{2}{5}x-4y=10$

For x=60

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

$\frac{2}{5}(60)-4y=10$

$24-4y=10$

$4y=24-10$

$4y=14$

$y=\frac{14}{4}\\\\ y=\frac{7}{2}$

therefore

Malik substituted 60 for y instead of x