Question

12

Given that
R
=
3
x
+
2
y

Find
x
when
y
=
7
and
R
=
8
x
=

Answer 1

x=-2

Explanation:

R=3x+2y

y=7, R=8

x=?

Substitute R and y with the values given

8=3x+2(7)

8=3x+14

Combine like terms

8-14=3x

-6=3x

x=-2