florindaperes1 florindaperes1

24-05-2016
Mathematics

contestada

-x - 7y = 18
4x + 7y = -30
How can you order a ladder?

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apologiabiology apologiabiology

24-05-2016

I can solve
add them equations

-x-7y=18
4x+7y=-30 +
3x+0y=-12

3x=-12
divide 3
x=-4
sub
-x-7y=18
-(-4)-7y=18
4-7y=18
minus 4
-7y=14
dividd e-7
y=-2

x=-4
y=-2
(-4,-2)

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