Answer:
(d)
Step-by-step explanation:
Elimination is a good choice of solution method when the coefficient of a variable in one equation is a simple multiple of the coefficient of that same variable in the other equation. This is the case for the system in the last choice. (see attached)
__
We can consider the alternatives:
(a) substitution for y would work well
(b) the solution is given, no solution effort is required
(c) substitution for y would work well
(d) elimination would work well.
3(2x +3y) +(-6x +y) = 3(18) +(12) . . . . . eliminates x (y=6.6)
(2x +3y) -3(-6x +y) = (18) -3(12) . . . . . . eliminates y (x=-0.9)
Answer: 140 miles
let me know if this is wrong
Step-by-step explanation:
135-30=105
105÷0.75=140
Answer:
$36
Step-by-step explanation:
A percent is always out of 100, no matter what.
If you need to find the percent of something try cross multipling like this.
x/720 x 5/100
5 x 720 = 3600
100x = 3600
divide 3600 by 100
and you get 36
21 and 2/3 all divided by 1 and 2/3 = answer
answer = 13