What is 2x-3y=9 -5x-3y=30

2 answers:

lina2011 [118]3 years ago

8 0

2x - 3y = 9 ⇒ -10x + 15y = -45
-5x - 3y = 30 ⇒ -10x - 6y = 60
 9y = 15
 9 9
 y = 1 2/3
 2x - 3(1 2/3) = 9
 2x - 5 = 9
 +5 +5
 2x = 4
 2 2
 x = 2
 (x, y) = (2, 1 2/3)

Shkiper50 [21]3 years ago

3 0

If your in algebra 1 then i'm pretty sure you subtract the 2x and that cancels and subract the 2x with the 9 and you have -3y= -2x+9 so you divide -3 to the -3y, the -2x and positive 9 and your answer will be y=2/3x-3

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The average height of 4 children is (15h-3). Two more children join the group with heights of (10h+46) centimeters and (14h-16)

oksian1 [2.3K]

Answer: 123.5 centimeters

Step-by-step explanation:

Let sum of observations be S and number of observations be n.

Average A= $\frac{\text{S}}{\text{n}}$

The average height of 4 children is (15h-3)

$(15h-3)=\frac{S}{4}\\\Rightarrow\ S=4(15h-3)\\\Rightarrow\ S=60h-45$

Also, when two more children join the group with heights of (10h+46) centimeters and (14h-16) centimeters the sum of heights of 6 children will be

$S+(10h+46)+(14h-16)=60h-45+10h+46+14h-16=84h-107$