3 years ago

How to solve the simultaneous equation 3x+7y=26 4x+5y=13

Mathematics

1 answer:

crimeas [40]3 years ago

4 0

Answer:

I found:

x=-3

y=5

Explanation: I would multiply the first equation by −4 and the second by 3 and add together the two equations (in columns):

{−12x−28y=−104

{12x+15y=39

0−13y=−65

So: y=65/13=5

Substitute back this value into the first equation:

3x+7⋅5=26

3x=26−35=−9

x=−9/3=−3

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