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put this solution on YOUR website!First equation:
4x+3y=320
Second equation:
5x+4y=406
Solve by elimination method.
Mulitply equation 1 by 4 and equation 2 by 3
4(4x+3y=320)
3(5x+4y=406)
16x+12y=1280 (1)
15x+12y=1218 (2)
Subbtract 1 by 2
x=62
solve for y
4(62)+3y=320
248+3y=320
3y=72
y=24
Hence, about $24--> dinner cost.
Paul.