Solve the system using elimination.
3x + 3y = -9
3х - Зу = 21

value of x = 2

y = -5

Step-by-step explanation:

here's the solution: -

the given equations are ,

=》3x + 3y = -9

=》3x - 3y = 21

so, let's add the equations,

=》3x + 3y + 3x - 3y = -9 + 21

=》6x = 12

=》x = 2

now, plugging the value x = 2, in equation 1 : -

=》3x + 3y = -9

=》(3 × 2) + 3y = -9

=》6 + 3y = -9

=》3y = -15

=》y = -5