Solve each system by substitution
2x+7y=3
-2x+y=-11
and show work please

Question

Solve each system by substitution
2x+7y=3
-2x+y=-11
and show work please

anonymous · Answer

start with the bottom equation

-2x + y = -11

solve for y

y = -11 + 2x 

plug this into the first equation wherever you see y

2x+7y=3

2x + 7*(-11+2x) = 3

2x -77 + 14x = 3

16x = 80

x = ?

plug the value of x into either equation and solve for y.

anonymous · Answer

Can you show me how to do y

anonymous · Answer

it really is as easy as plugging in the value of x into either equation and then just a bit of algebra.

anonymous · Answer

Just subtract the second equation from the first equation. Your y's will cancel out and then you can solve for x. Then plug your x into either equation and then solve for y

anonymous · Answer

I mean can you show me using numbers

anonymous · Answer

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