154k views
2 votes
Which ordered pair is the solution to the system of equations?

2x-5y=-5
x+2y=11
   A.

(3, 4)    B. (5, 3)    C. (7, 2)    D. (15, 7)
User Xibinke
by
8.1k points

2 Answers

4 votes
Im using the substitution method because i feel that its easier but you can use any method you prefer. You would start with one equation and isolate a variable( leave it by itself). I started with the second equation (x+2y=11) because the variable x does not have a coeficcient (the number before the variable). I just subtracted 2y from both sides of the equation and got x=-2y+11 or x=11-2y (same thing). Then i substituted or plugged in -2y+11 as x in the firth equation so it would be 2(-2y+11)-5y=-5 . Then i would distribute to get -4y+22-5y=-5 and combine like terms to solve and get that y=3. Then just plug in 3 as y in the second equation and solve for x to get that x=5 and y=3 making your ordered pairs (5,3). Ps sorry if it was long hope i helped
User Rawland Hustle
by
8.5k points
1 vote


You asked a question similar to this recently. This time I will show the multiplication and subtraction method instead of the substitution one.

2x-5y=-5 | x+2y=11

2x-5y=-5 | 2x+4y=22

Subtract the first equation form the second.

9y=27

y=3

Then substitute.

x+2(3)=11

x+6=11

x=5

The final answer is the ordered pair (5,3).

User Yoric
by
7.6k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories