Answer:
Step-by-step explanation:
Question one
The slope is simply read. It is - 2
So far what you have is
y = mx + b
m = -2
y = - 2x + b
The point is a little different
(-1,1) means
x = - 1
y = 1
y = -2x + b
1 = -2(1) + b
1 = - 2 + b
1 + 2 = - 2 + 2 + b
3 = b
Complete line
y = -2x + 3
Problem 2
(0,-6 is where you should start. That's the y intercept. In the equation y = mx + b it gives you b immediately.
y = mx + b
-6 = 0m + b
b = - 6
The x intercept occurs when y = 0
0 = m(-2) - 6 Add 6 to both sides
6 = - 2m - 6 + 6
6 = -2m Divide by -2
6/-2 = m
m = - 3
Equation
y = -3x - 6
Answer:
2:1
Step-by-step explanation:
The perimeter of the first is twice as large as the 2nd
Answer:
(a^2)+4a-5
Step-by-step explanation:
(3+a+2)(a+2-3)
(a+5)(a-1)
use FOIL or box method
5a-5+(a^2)-a simplifyes to
(a^2)+4a-5
The given equation is 4x^2=x^3+2x.
On the left side it has 4x² and on the right side the expression is x³+2x.
So, if we have any system of equations in which we have these two expression which will be equal to any other variable then we can use that system of equations to find the roots.
Now notice that in option D it's given,
y=4x² and y=x³+2x.
So, if we will equate this equations then we will get the same above equation which will be use to find the roots.
So, D is the correct choice.
Answer:
2520ft
Step-by-step explanation:
Calculation for what is the scale of the model?
Let x will be the span length
Hence,
x= 4200 feet long/20 inches long
x=210
Thus:
1 inch = 210 ft
1 ft = 2520
=2520ft
Therefore the scale of the model will be 2520ft