Question

find the solutions sets of the following system of equations. 1) 3x -y=5. 3x+3y=21​

Answer 1

Answer:

3x-y=5...eq(1)

3x+3y=21

3(x+y)=21

x+y=21/3

x+y=7..(eq2)

y=7-x

substituting in eq1:

3x-(7-x)=5

3x+x-7=5

4x=12

x=3

y=7-3

y=4

Step-by-step explanation: