Question

Solve using elimination. x-2y=10 3x+y=-12

Answer 1

Answer:

x-2y=10-------equation 1

3x+y=-12-------equation 2

multiply equation 1 by 3 and subtract eqn 2 by equation 1 then we get,

3x-6y=30

3x+y=-12

(-) (-) (+)

---------------

-7y=42

or, -y= 42÷7

or, y=-6

put the value of y in equation 1

x-2×(-6)=10

or, x+12=10

or x=10-12

or, x = -2

therefore x = -2 and y=-6 ans.