# How do you solve the simultaneous equations #y = 3x# and # x + 2y =21#?

##### 1 Answer

Jul 13, 2015

Since we are given an expression for

#### Explanation:

[1]

[2]

Based on [1], we can replace

[3]

Simplifying:

[4]

or

[5]

Based on [5], we can replace

[6]

or

[7]