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Sagot :
The cost for one steak burger is $4.5. The price/ The cost of one order of fries is $2.25
Solution
Let one steak burger cost $x
and one fries order cost $y
Hence, we have
3x+2y = 18-----------1
2x+3y = 15.75-------2
Let us solve the equation simultaneously
multiply equation 1 by 2 and equation 2 by 3
6x + 4y = 36 ---------3
6x + 9y = 47.25 ----4
subtraction 4 from 3 we have
0x -5y = -11.25
Divide both sides by -5
y = 11.25/5
y = $2.25
Put y = 2.25 in equation 1 to find x
3x+2(2.25) = 18-----------1
3x + 4.5 = 18
3x = 18 -4.5
3x = 13.5
x = 13.5/3
x = $4.5
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