Answer:
Answer B.
Step-by-step explanation:
x+2y=10
2x+8y=16
x=-2y+10
2x+8y=16
2(-2y+10)+8y=16
-4y+20+8y=16
4y=-4
y=-1
x=-2y+10
x=-2(-1)+10
x=2+10
x=12
one solution
1+7 and 7+1 equal the same amount. It doesn't matter which position the number is in. The sum will be 8 either ways. Hope that helps :)
Given problems;
1. Factor; x²+5x-24
To factor this equation, we must understand that this is a quadratic equation.
A quadratic equation usually has two roots.
x²+5x-24 = 0
- Then find two numbers whose product is -24 and their sum is +5
the numbers are +8 and -3
then replace 5x with the number;
x² + 8x - 3x - 24 = 0
Now factorize;
x(x +8) - 3(x + 8) = 0
(x-3)(x+8) = 0
Factoring gives (x-3)(x+8)
2. Factor 2n² - 5n -3;
Equate to zero;
2n² - 5n -3 = 0
Find the number whose sum is -5 and the product gives -6( 2 x -3);
the number is -6 and +1;
2n² - 6n + n -3 = 0
2n(n-3) + 1(n-3) = 0
(2n + 1)(n-3) = 0
The factor of the equation is (2n + 1)(n-3).
Given:
Length = 20 cm
Width = 4.5 cm
Height = 23 cm
To find:
Surface area of rectangular prism
Solution:
Surface area formula:
SA = length × width × height
= 20 × 4.5 × 23
= 2070
Surface area of cylinder is 2070 square centimeters.
The domain is ur x values....so going along the line on ur x axis.....open circle means no equal sign....closed circle means there is an equal sign...
-2 < x < = 3
