Question

X-3y=7 3x-3y=15 by elimination method

Answer 1

Step-by-step explanation:

multiple 1st equation by 3

(x-3y=7)3

3x-9y=21

-3x-3y=15

- + -

==========

-6y= 6

y=6/-6

y= -1

substitute the values

x-3y=7

x-3*-1=7

x-(-3)=7

x+3=7

x=7-3

x=4

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