anonymous 5 years ago use substitution to solve the system {2x-5y=-5, -2x+8y=-58

1. amistre64

id rather just use common sense

2. amistre64

3y = 63; y = 21 x = 10

3. anonymous

thanks

4. anonymous

actually it looks like you get 3y = -63 so y = -21 yes?

5. anonymous

$2x-5y=-5$ $-2x+8y=-58$ add to get $3y=-63$ $y=-21$ substitute back to get $2x-5\times -21=-5$ $2x+105=-5$ $2x=-110$ $x=-55$

6. amistre64

lol.... did i drop a negative

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