You graph a system of linear equations, and the solution appears to be (3,4).How can you verify that the solution is (3,4)?

Question

I need help! This is due tomorrow!!

Answer 1

 

 Rewrite the first equation , wherever you see and X, you write 3, and wherever you see y write 4.

 Then calculate the result to see if it matches the right side.

 

 Do the same for second equation.

 

 So if you plug in X=3 and Y=4, it should give the same number on the right side of each equation.

 

 For EXAMPLE.

 

    3x + 2y = 17

    x   + y   = 7

 

has solution (3,4) 

 

BECAUSE

 

 3(3) +2(4) = 9 + 8 = 17 <---- first equation checks

 3 + 4 = 7  <--- second equation checks