Question

4x+3y=23403x+4y=2280

Answer 1

4x+3y=2340 ------------------(1)
3x+4y=2280 ------------------(2)
Multiplying (1) with 3 and (2) with 4 we get,
12x+9y=7020 ----------------(3)
12x+16y=9120 --------------(4)
Subtracting (3) from (4) we get,
7y=2100
or, y=2100/7
or, y=300
Putting in (1) we get,
4x+3×300=2340
or, 4x=2340-900
or, 4x=1440
or, x=1440/4
or, x=360
∴, $\left \{ {{x=360} \atop {y=300}} \right.$