eliminating y
x - y = -5
3x + y = 1
________ +
4x = -4
x = -1
eliminating x
• x - y = -5 ....... (x3)
3x + y = 1 ....... (x1)
• 3x - 3y = -15
3x + y =1
___________ -
-4y = -16
y = 4
A. (-1, 4)
Answer:
Step-by-step explanation:
1) In the first equation, - 4x was added to both sides of the equation. This is expressed as
6x - 4x + 9 = 4x - 4x - 3
2x + 9 = - 3
2) In the second equation, both sides of the equation was multiplied by - 1/4. This is expressed as
- 4 × - 1/4(5x - 7) = - 18 × - 1/4
5x - 7 = 4.5
3) In the third equation, - 4 was added to both sides of the equation. This is expressed as
8 - 10x = 7 + 5x
8 + (- 4) - 10x = 7 + (-4) + 5x
8 - 4 - 10x = 7 - 4 + 5x
4 - 10x = 5 + 5x
4) In the fourth equation, both sides of the equation was multiplied by - 4. This is expressed as
- 5x/4 × - 4 = 4 × - 4
5x = - 16
5) In the fourth equation, both sides of the equation was multiplied by 1/4x and 1/4. This is expressed as
12x × 1/4x + 4 × 1/4 = 20x × 1/4x + 24 × 1/4
3x + 1 = 5x + 6
2 and 5/8: You would go from the number the fraction is closest to, and then add the fraction itself.
Y = kx
4.8 = 4k
k = 4.8/4 = 1.2
Therefore, required equation = y = 1.2x
Answer: To solve this question, you would first measure yourself and your self and your shadow, and then the shadow of the tower while the sun is in spot in the sky, you will then use the ratio (your height/your shadow) = (towers height/ towers shadow)
You will then cross multiply and divide to find the towers height
Step-by-step explanation:
