Answer:
x=-15
x=6
x=3
x=-21
Step-by-step explanation:
Step 1: Line up the equations so that the variables are lined up vertically.
Step 2: Choose the easiest variable to eliminate and multiply both equations by different numbers so that the coefficients of that variable are the same.
Step 3: Subtract the two equations.
Step 4: Solve the one variable system.
Step 5: Put that value back into either equation to find the other equation.
Step 6: Reread the question and plug your answers back in to check.
Answer:
6
Step-by-step explanation:
This looks like a linear function.
From the first two points, we get the equation to be y=2x-1.
So to find n, 11=2n-1.
12=2n
n=6
Answer:
y = 10/3x - 18
Step-by-step explanation:
1. Take the reciprocal of the slope given to you, 3/10 -> 10/3
2. Write your new equation with the new slope in slope-intercept form: y=10/3x+b
3. Use the point given to find your y-intercept / b: -8 = (10/3)(3)+b
-8 = 10 + b
-18 = b
4. Plug b back into your new equation. y = 10/3x - 18
100
This is a difference;
(10n+1)(10n-1)
When the brackets are expanded they give;
