Question

Elimination Method2x+ 4y=10X+ y=15

Answer 1

1) Let's pick the 2nd equation and to eliminate the x variable, multiply by -2 then add both equations like this

2x+ 4y=10

-2X+ -2y=-30

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2y = -20

y = -10

2) Now let's plug that y=-10 into one equation, usually the simpler one.

x +y = 15

x -10 = 15 add 10 to both sides

X = 15 +10

x=25

3) So the solution is S ={25, -10}