Question

Solve the system of linear equations using elimination. −3x − 5y = −15 −3x − 3y = −3

Answer 1

From the equation we have :
-3x-5y=-15-3x-3y <=> -5y = -15-3y<=> 15= 5y-3y <=> 2y= 15 <=> y=15/2
We also have:
-3x-5y =-3. Given y= 15/2 => -3x -5(15/2)=-3 <=> -3x = -3x +5(15/2) = 34.5 <=> x = 34.5/3 =23/2 = 11.5

Answer 2

Answer: x= -5; y=6

Explanation:

−3x − 5y = −15

−3x − 3y = −3 .(-1)

−3x − 5y = −15

+3x +3y = +3

0 - 2y = -12

y = - 12

-2

y=6

−3x − 3y = −3

- 3x -3.6 = -3

-3x -18 = -3

-3x = 18-3

x= 15

-3

x= -5