there is no solution for this answer
solve problems by elimination
eqn1) 3x+3y=10
eqn2) -9x-9y=-30
1st multiply eqn 1 by 3
= 9x+9y=30
now add the 2 equations
eqn1) 9x+9y=30
eqn2) -9x-9y=-30
x term: eqn1+eqn2 = (9x-9x) =0x
y term: eqn1+eqn2 = (9y-9y) =0y
coefficient term: 30-30=0
new eqn = 0x +0y = 0
