3 years ago

Carlos bought the items shown in the table. What was the total cost, not including tax?

Mathematics

1 answer:

ExtremeBDS [4]3 years ago

7 0

the fact that there is no chart makes it hard

Step-by-step explanation:

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3 years ago

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When it says "is a less than b" , it means b - a not a-b.

x+y +z = 105
z = 10y - 11
2x = 3y + 7

Substitute expressions in terms of "y" for x and z in top equation.
$\frac{3y+7}{2} + y + (10y-11) = 105 \\ \\ (3y+7) + 2y+2(10y-11) = 210 \\ \\ 25y-15 = 210 \\ \\ y = \frac{225}{25} = 9$

Substitute value of y to find x and z:
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