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frez [133]
3 years ago
7

Please help me it’s urgent! I WILL MARK AS BRANLIEST!

Mathematics
1 answer:
UkoKoshka [18]3 years ago
3 0

Answer:

(1,4)

Step-by-step explanation:

2x-3y=-10

y=4x

Since the y is already isolated, you can use substitution to find the answer to this equation. Simply replace any y values in the first equation with 4x:

2x-3(4x)=-10

2x-12x=-10

-10x=-10

x=1

y=4(1)=4

Hope this helps!

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7 watermelons cost $8.96.Which equation would help determine the cost of the 5 watermelons?
postnew [5]

Answer: ($8.96 / 7) * 5                        or $6.40

Step-by-step explanation: You need to find the price for one watermelon then multiply it by 5 to find the price of 5.

4 0
3 years ago
Read 2 more answers
Given vectors A (2,-1,5), B (4,3,-2) & C (5,4,0), find:?
MrRissso [65]
A) 4a - 3b + 2c

4(2, -1, 5) - 3(4, 3 , -2) + 2(5, 4, 0) = (8, -4, 20) - (12, 9, - 6) + (10, 8, 0) =

= (8 - 12 + 10 , -4 - 9 + 8 , 20 + 6 + 0) = (6, - 5, 26)

Answer: (6, - 5, 26)

b) magnitude of vector b

\sqrt{4^2+3^2+(-2)^2} = \sqrt{16+9+4} = \sqrt{29} ~ 5.4

c) vector of length 7 parallel to vector c

=> m(5,4,0) = (5m,4m,0)

=>    \sqrt{(5m)^2+(4m)^2+0}= \sqrt{25m^2+16m^2}= \sqrt{41m^2}=m \sqrt{41}=7

=> m = 7 / √41 ≈ 1.093

=> 1.093 (5, 4, 0) = (5.465 , 4.372, 0)

Answer: (5.465 , 4.372 , 0)
7 0
3 years ago
How many solutions are there to this equation 3(x-4)+5-x=2x-7
Svetlanka [38]
3x-12+5-x=2x-7
2x-7 =2x-7

Means there are infinite solutions.
8 0
2 years ago
math:John is buying new shoes. He finds the shoes he wants on sale for 30%, and the original price is $88. How much will he pay
ra1l [238]

Answer:

26.4

Step-by-step explanation:

hd hd hd hd hd hd hd hd hd hd hd hd

4 0
3 years ago
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If x = 4cosa and y = 5tana, find (x^2/16) - (y^2/25)​
Cloud [144]

x = 4 \cos(a)

\frac{x}{4}  =  \cos(a)  \\

( { \frac{x}{4} })^{2}  =  ({ \cos(a) })^{2}  \\

\frac{ {x}^{2} }{16}  =  {cos}^{2} (a) \\

_____________________________________________

y = 5 \tan(a)

\frac{y}{5}  =  \tan(a)  \\

( { \frac{y}{5} })^{2}  = ( { \tan(a) })^{2}  \\

\frac{ {y}^{2} }{25}  =  {tan}^{2} (a) \\

_____________________________________________

Thus ;

\frac{ {x}^{2} }{16}  -  \frac{ {y}^{2} }{25}  =  \\

{cos}^{2} (a) -  {tan}^{2} (a)

3 0
2 years ago
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