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matrenka [14]
3 years ago
10

What is the solution to the system of equations below? -4x+6y=-18 and y=-2x+21

Mathematics
1 answer:
Verdich [7]3 years ago
3 0

Answer:

x=9 and y=3

Step-by-step explanation:

Let's solve your system by substitution.

−4x+6y=−18 and y=−2x+21

Rewrite equations:

y=−2x+21;−4x+6y=−18

Step: Solve  y=−2x+21for y:

y=−2x+21

Step: Substitute−2x+21foryin−4x+6y=−18:

−4x+6y=−18

−4x+6(−2x+21)=−18

−16x+126=−18(Simplify both sides of the equation)

−16x+126+−126=−18+−126(Add -126 to both sides)

−16x=−144

−16x

−16

=

−144

−16

(Divide both sides by -16)

x=9

Step: Substitute9forxiny=−2x+21:

y=−2x+21

y=(−2)(9)+21

y=3(Simplify both sides of the equation)

Answer:

x=9 and y=3

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fredd [130]

Answer:

1  = 25/50

2 =  1/2

3 = 0.50

4 = 50%

Step-by-step explanation:

i got it right on edg and i hope it helps :)

4 0
3 years ago
What about this one ??
V125BC [204]
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4 0
3 years ago
The ratio of students wearing sneakers to those wearing boots is 4 to 5. If there are 36 students in the class, and all of them
yaroslaw [1]

Answer:

16

Step-by-step explanation:

Let's denote:

a: number of students wearing sneakers

b: number of students wearing boots

We have:

a + b = 36

a/b = 4/5 (multiply both sides by b => a = 4b/5)

Substitute a = 4b/5 into a + b = 36

=> 4b/5 + b = 36

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=> 9b/5 = 36

=> b/5 = 4

=> b = 20

=> a = 4b/5 = 4(20)/5 = 16

7 0
3 years ago
Michael made 12 out of 18 free throws at basketball practice. What is the ratio of baskets made to the total numbers of baskets?
ludmilkaskok [199]

Answer:

2:3

Step-by-step explanation:

You can simplify 12/18 to 2:3 also if michel is that good at basketball he should go to the NBA

5 0
2 years ago
I need help on number 5 ASAP
Alex

Answer:

540°

Step-by-step explanation:

If a triangle (3 sides) has 180 degrees then we can figure out the degrees in a pentagon.

180° + 360° = 540°

How? The "top" part could be seen as a triangle (180 degrees), and we know that a quadrilateral's angles add up to 360 degrees, so when we add them together we get out answer!

6 0
2 years ago
Read 2 more answers
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