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Tomtit [17]
3 years ago
7

A housepainter buys 40 gallon-size cans of paint for $920. Some of these are blue paint that cost $30 per gallon and the rest ar

e white paint that cost $20 per gallon. How many gallons of white paint does the painter buy?
Mathematics
1 answer:
zloy xaker [14]3 years ago
3 0

Answer:

28

Step-by-step explanation:

x=blue

y=white

x+y=40

30x+20y=920

30(x+y=40) ; 30x+30y=1200___[1]

30x+20y=920 ; 30x+20y=920___[2]

[1]-[2] : 30x+30y-30x-20y=1200-920

       10y=280

       y=28

painter buys 28 white gallons

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Select the multiplication sentence that applies the associative property of multiplication to the example. Example: 6 × (4 × 2)
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answer : D

A. (6 × 7) + 6 = 48

Associative property of multiplication . Here we have +6 . there is a + sign inbetween.  so it does not comes under Associative property of multiplication

B. 6 × (4 + 2) = 36

Here we have 4 +2 . there is a + sign inbetween.  so it does not comes under Associative property of multiplication

C. (6 + 4) × 2 = 20

Here we have 6 + 4 . there is a + sign inbetween.  so it does not comes under Associative property of multiplication

D. (6 × 4) × 2 = 48

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4 0
4 years ago
Y=-3x-5 <br> y=4x+30<br> PLS HELP ASAP
Dominik [7]

{y,x} = {10,-5}

Step-by-step explanation:

sorry if this dont make sense

solve equation [2] for the variable y

y = 4x +30

plug this in for variable y in equation [1 ]

(4x+30) +3x= -5

solve [1] for the variable x

7x= - 35

x= - 5

by now we know this much

y= 4x+30

x= - 5

use the x value to solve for y

y=4 (-5) + 30 = 10

solution

{y,x} = {10,-5}

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Step-by-step explanation:

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4 years ago
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Dennis_Churaev [7]
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