Question

Given that
R
=
6
x
+
5
y

Find
y
when
x
=
7
and
R
=
18

Give your answer as an improper fraction in its simplest form.

Answer 1

R = 6x + 5y

x = 7, R = 18

Substitute them in: 18 = 6(7) + 5y
18 = 42 + 5y
-24 = 5y
y = -24/5

It’s already in its simplest form