Question

Given that 2x – 7y = 30

Find y when x = = -3
Give your answer as an improper fraction in its simplest form.
y =

Answer 1

5.1

Explanation:

2*-3 - 7y =30

-6 + 7y = 30

7y = 30 + 6

y = 36 / 7

i.e. y = 5.1

Answer 2

x = -3; substitute it to the other equation.

2(-3) - 7y = 30

-6 - 7y = 30

-7y = 30 + 6

-7y = 36

y = -36/7

we will not round the number because the question is asking for an improper fraction at its simplest form.