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4 years ago

If 3x + 7y = 37 and x= 3, then y =

Mathematics

2 answers:

Gemiola [76]4 years ago

7 0

Answer:

y = 4

Step-by-step explanation:

Given

3x + 7y = 37 ← substitute x = 3 into the equation

3(3) + 7y = 37, that is

9 + 7y = 37 ( subtract 9 from both sides )

7y = 28 ( divide both sides by 7 )

y = 4

Mama L [17]4 years ago

5 0

Answer:

step-by-step-explanation:

3x + 7y= 37

x = 3

3×3 + 7y =37

9 + 7y = 37

37 - 9 = 28

28 ÷ 7 = 4

y = 4

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Find missing side x trig quiz q.4

Sladkaya [172]

Answer:

Step-by-step explanation:

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3 years ago

A bag contains purple marbles and white marbles, 68 in total. The number of purple marbles is 4 less than 5 times the number of

galina1969 [7]

Answer: 56 purple marbles.

Step-by-step explanation:

Let be "p" the number of purple marbles in the bag and "w" the number of white marbles in the bag.

You can set up the following System of equations:

$\left \{ {{p+w=68} \atop {p=5w-4}} \right.$

You can use the Substitution method to solve the System of equations. The steps are shown below:

1. You need to substitute the second equation into the first equation:

$(5w-4)+w=68$

2. Now you must solve for "w":

$5w-4+w=68\\\\6w-4=68\\\\6w=68+4\\\\6w=72\\\\w=\frac{72}{6}\\\\w=12$

3. Substitute the value of "w" into second original equation and then evaluate in order to find the value "p":

$p=5(12)-4\\\\p=60-4\\\\p=56$

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3 years ago

Joe buys a set of books that cost $45.58. He gives the cashier three (3) $20 bills and three (3) pennies. How much change should

marusya05 [52]

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He should receive $14.45 in change.

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3 years ago

6 The bar chart shows the A-level mathematics grades achieved by some students one year. A-level grades 120 100- 80 Frequency 60

skelet666 [1.2K]

Answer:

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Step-by-step explanation: