Answer:
Step-by-step explanation:
1. 3x2 + 5x - 4 + 6x2 - x + 7
= combining like terms
= 9x2 + 4x + 3
2. 2y2 - 3y + 6 + y2 - 5y - 1 + (-4) + 2y2 - 2y
= 5y2 - 10y + 1
3. 2x2y - 3xy2 + x2y - 4x2y - 2xy2
= - x2y - 5xy2
4. x2 - y2 + 2x2 - 3xy + 4y2 + 3y2 - 5xy - x2
= 2x2 - 8xy + 6y2
The answer is a because 6x3 is 18 and the simble is this<_
Answer:
cent/km
Step-by-step explanation:
Given
Required
The fuel cost in 
This is calculated using:
Multiply by 
to get the cost in cents
cent/km
cent/km
Answer:
y = 3x - 31
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
here m = 3, thus
y = 3x + c ← is the partial equation
To find c substitute (9, - 4) into the partial equation
- 4 = 27 + c ⇒ c = - 4 - 27 = - 31
y = 3x - 31 ← equation in slope- intercept form
