5x + y = 6
5x + 3y = -4

The y-coordinate of the solution to the system shown is _____.

-5
-1
.5
1

Question

5x + y = 6
5x + 3y = -4

The y-coordinate of the solution to the system shown is _____.

-5
-1
.5
1

reneeshumpert · Answer

I was thinking maybe I could substitute each number in for y , but that confused me

thesmartone · Answer

If you solve the system of equations using elimination...

$\sf ~~~5x + y = 6\ - \~~~5x + 3y = -4 \-------
$

Subtract both equations.

reneeshumpert · Answer

um, I may sound stupid but how would I subtract the equations? like regular subtraction?

reneeshumpert · Answer

I got x+2y=10

thesmartone · Answer

5x-5x = 0

Just ignore the variable and subtract the 2 numbers and at the end put back the variable.

thesmartone · Answer

So to subtract 
y- 3y

Think of it as 1-3
And whatever you get put 'y' right next to it.

thesmartone · Answer

So what is $\sf 1-3=?$

reneeshumpert · Answer

it would be -2 .. do if 5x-5x becomes 0 I wouldnt have a x variable at all anymore ?

thesmartone · Answer

yup the x would go away becaue 0x = 0 = nothing

and sine it equals to -2 we add the y back and we get $\sf -2y$

reneeshumpert · Answer

so the overall new equation is -2y=10 ? or did I miss something ?

thesmartone · Answer

What is $\sf 6-(-4)=?$
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