Question

*help requested*
*fan and medal awarded*


Simplify 3x + 9 over 3
3x + 3
x + 3
x + 9
x


What is the equation of the line that passes through the points (-2, 3) and (2, 7)?
x - y = -1
x - y = -2
x - y = - 5
x - y = - 6

Evaluate: 18 + 4 ÷ 2 - 8
2
8
12
3

Answer 1

ummm the last one is 3, im still trying to find out the others

Answer 2

Divide each term separately\[\frac{ 3x + 9 }{ 3 }\]-----\[\frac{ 3x }{ 3 } = x\]\[\frac{ 9 }{ 3 } = 3\] x + 3

Answer 3

2)
Point-Slope form. y - y1 = m(x - x1)

Find slope.
(-2, 3) and (2, 7)
\[m =\frac{ y2 - y1 }{ x2 - x1 }\]\[m = \frac{ 7 - 3 }{ 2 -(-2) } = \frac{ 7 - 3 }{ 2 + 2 } = \frac{ 4 }{ 4 } = 1\]Slope(m): 1
Point: (-2, 3)

y - 3 = 1(x - (-2))
y - 3 = 1(x + 2)

Change to Slope-intercept form. y = mx + b

Distribute.
y - 3 = x + 2
Add 3.
y = x + 5

Change to standard form. Ax + By = C
'A' cannot be a negative or a fraction.

y = x + 5
Subtract x from both sides.
-x + y = 5
Multiply everything by -1.
\[-1(-x + y = 5)\] x - y = -5 <-- Your answer. (:

Answer 4

3) Use the order of operations: PEMDAS.

- Parenthesis
- Exponents
- Multiplication/ Division
- Addition/ Subtraction

18 + 4 ÷ 2 - 8
Divide 4 by 2.
18 + (4 ÷ 2) - 8
18 + 2 - 8
Add 18 and 2.
20 - 8
Subtract and Solve (: