Question

Solve x-3y=7 and 3x-3y=15 by substitution method

Answer 1

Answer:

y=-1 and x=4

Step-by-step explanation:

x-3y=7

x=7+3y.......(1)

3x-3y=15......(2)

Substituting (1) in (2)

3(7+3y)-3y=15

21+9y-3y=15

21+6y=15

6y=15-21

6y=-6

y =-1

x=7+3y

=7+3(-1)

=7-3

x=4

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