Question

3) 4x+3y=7 3x-7y=-3

Answer 1

4x+3y=7
y=(7-4x)/3
3x-7y=-3
3x-(7(7-4x)/3=-3
3x-(49-28x)/3=-3
3x-(49/3)+(28x/3)=-3
3x+(28x/3)=-3+(49/3)
(37/3)x=40/3
x=40/37
4(40/37)+3y=7
y=(99/37)/3
y=33/37
espero te sirva