Question

simultaneous equations:
solve it using the method of elimination by equating coefficients

Answer 1

of we divide 1st eqn with 100 we get
x+2y=240×3
3x-y=20×1
_________
3x+6y=720
3x-y=20
- + -
________
0+7y=700
y=100sub in 3x-y=20we get
3x=20+100
3x=120
x=40