Question

X=10
3x+3y= 20
What is the solution (x,y) of the system

Answer 1

First thing first you need to arrange your numbers in away so you can solve and understand .
3(10)+3y=20
30+3y=20
-20+3y=20
10=3y
Y=-10/3
Y=-3+1/3

Answer 2

(10, -10/3)

Explanation:

We're told that x = 10. Substitute 10 for x in the 2nd equation:

3(10) + 3y = 20. Subtracting 30 from both sides, to isolate 3y, we get:

3y = -10

Dividing both sides by 3, we get: y = -10/3.

The desired solution is (10, -10/3).