Question

Solve the system of equation using subtraction 3x+2y=7 y=-3y+11

Answer 1

Assumig 2nd euqation is y =-3x+11
using subtraction

minus y both sides and minus 11
-3x-y=-11

add to other equation to eliminate  y's

-3x-1y=-11
3x+2y=7 +
0x+1y=-4

y=-4


sub back


y=-3x+11
-4=-3x+11
minus 11 both sides
-15=3x
divide both sides by 3
-5=x


(x,y)
(-5,-4)