Question

tell whether the ordered pair ( 5,-3) is a solution of the system { -3x+2y=-21}
{-x-y=-2}

Answer 1

@texaschic101

Answer 2

@Hero

Answer 3

@texaschic101

Answer 4

@Peaches15

Answer 5

@Hero

Answer 6

@LynFran @demiac259 @Destinyyyy @DullJackel09 @lostinrome @ChrystalC @Chris01

Answer 7

you can sub in your points into each equation and if the equations come out true (both of them), then it is a solution. Understand ?

Answer 8

Let me set up the first equation...
-3x + 2y = -21 (x = 5 and y = -3)
-3(5) + 2(-3) = -21
now work that out and tell me if it is true.

Answer 9

do the same for the other equation...
-x - y = -2
-5 - (-3) = -2
Is that true ?

If they are BOTH true, then those points are a solution, But if even 1 of them is false, then it is not a solution

Answer 10

Let me know what you come up with :)

Answer 11

-5-(-3)=-2 @texaschic101

Answer 12

-3x + 2y = -21
-3(5) + 2(-3) = -21
-15 - 6 = -21
-21 = -21 (true)

-x - y = -2
-5 - (-3) = -2
-5 + 3 = -2
-2 = -2 (true)

so if they are both true, which they are, then the solution is true and (5,-3) are points that satisfy this set of equations :)