Answer:
The solution to this system is (-2,1)
Step-by-step explanation:
The given system of equations is;
...eqn1
and
....eqn2
We make y the subject of the second equation to get:
...eqn3
We put eqn3 into eqn1 to get;
We expand to get:
Simplify both sides to get:
Put x=-2 into eqn3
The solution to this system is therefore (-2,1)
D
180-70=110
110+40=150
180-150=30
150/2=75