Please help quickly.Thanks :)

Question

13-02-2019
Mathematics

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Please help quickly.Thanks :)

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Аноним Аноним · Answer 1 · 2019-02-13T07:48:51+01:00

Multiply 2x-5y= -21 by 3 to make it 6x-15y= -63
Multiply 3x-3y= -18 by -5 to make it -15x+15y=90

This cancels the y’s out which leaves us with

6x=-63
&
-15x=90

x for 6x=-63 equals - 10.5 so x is - 10.5 and for -15x=90, x= -6

Then you plug in x into any equation you’d like to find y.

Let’s plug in - 10.5 into 6x... equation.

6(- 10.5)-15y=-63

63-15y= -63
-63 -63

-15y=0
y=0 and x= - 10.5. When you plug in this values it makes the equation true!

But the correct answer is the first one north. Sorry if I’m doing too much hahah

If I’m confusing here’s the right answer...

6x-15y= -63
-15x+15y=90