trackboy trackboy

25-02-2016
Mathematics

contestada

What is-2x+6y=6 7x+8y=-6?

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dhgurwls dhgurwls

25-02-2016

we can solve this by substitution

-2x=6-6y

-2x/-2=(6-6y)/-2
x= -3+3y

7(-3+3y)+8y=-6
-21+21y+8y=-6
29y=15
y=15/29

-2x+6(15/29)=6
-2x+90/29=6
-2x=6-90/29
-2x= 174/29-90/29
-2x= 84/29
-2x(29)=(84/29)29
-54x=84
x= -84/54
x= -14/9

so x= -14/9
y= 15/29

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