X = 3z - 22
z = 6
5x + 4y + 3z = 14
5 (3z - 22) + 4y + 3 (6) = 14
15z - 110 + 4y + 18 = 14
15 . 6 - 110 + 4y + 18 = 14
90 - 110 + 4y + 18 = 14
90 - 110 + 18 - 14 + 4y = 0
-16 + 4y = 0
4y = 16
y = 4
Answer:
5 boxes is needed or 10 kg of seeds so yes!!
Step-by-step explanation:
first of all we know that the area of 9by 5 (9x5) is 45 and 45=3 kg of seed, so divide 45 ( the area) by 3 (the amount of kg) and so 45 ÷ 3 is 15 so now you have a UNIT of 1kg for every 15 square Meters, and 140 needs a little more than 9.3 kg worth of seeds so she has enough :)
The other words are just meant to be confusing just think of ratios :P
1kg:15m
-2x+x-4=-7 , -1x=-3, x=3. y=3-4, y=-1
Answer:
you need to use the before change and after method.
Answer:
y = -2x - 3
Step-by-step explanation:
Given:
Equation of -x +2y =4
Point of (-2,1)
-x + 2y = 4
y = x/2 + 2 or y = 1/2x + 2
Which means the equation's slope is m = 1/2.
The slope of the perpendicular line is negative inverse which is m = -2.
Now we have an equation of y = -2x + a.
Use (-2, 1) to find a:
1 = (-2)(-2) + a
a = -3
y = - 2x - 3