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Firdavs [7]
2 years ago
14

Solve each substitution ( I need help )

Mathematics
1 answer:
lozanna [386]2 years ago
5 0
In each of the problems, one of the equations is solved for y. Just plug in what y is equal to into the other equation.

1.) Plug -3 in for y.
-3 = 7x - 10
7x = 7
x = 1

2.) Plug -8 in for y.
-8 = -2x - 12
-2x = 4
x = -2

9.) Plug -8x in for y.
2x + 4(-8x) = 0
2x - 32x = 0
-30x = 0
x = 0

10.) Plug 2x in for y.
6x + 7(2x) = 20
6x + 14x = 20
20x = 20
x = 1


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The chorus teacher plans to arrange the students in equal rows. Only the girls or boys will be in each row. What is the greatest
emmainna [20.7K]

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2

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in a 30°-60°-90° triangle, the ( blank) is the (blank) the length of the ( blank) while the longer leg is ( blank) times the len
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Step-by-step explanation:

4 0
3 years ago
A pharmacist has a 12% solution and a 20% solution of boric acid. How much of each should she use to make 80 grams of a 15% solu
nlexa [21]

Step-by-step explanation:

If x = the amount of 12% and y = the amount of 20%, then x + y = 80

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We are given that .12x + .20y = 12.

We can solve the first equation for x or y. Let's do x.

x = 80 - y

.12(80 - y) + .20y = 12

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5 0
3 years ago
Read 2 more answers
Marty's friend Tom makes and hourly wage of $15.00 per hour. Using that there are 40 hours in a standard work week, there are 52
Lorico [155]

Answer:

a. annual income = $31,200

b. Social Security tax  = $1,934.40

c. Medicare =  $452.40

Step-by-step explanation:

40 hours in a week

52 weeks in a year

Tom makes $15 / hour

In a year, the

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b. Social Security tax = 31200 * 0.062 = 1934.40

c. Medicare = 31200 * 0.0145 = 452.40

3 0
3 years ago
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