She will run 5280 yards and swim 450 feet.
She runs 3 miles; 1 mile = 5280 feet:
3(5280) = 15840 ft
It takes 3 feet to make 1 yard:
15840/3 = 5280 yds
She swims 150 yards; 1 yard = 3 feet:
150(3) = 450 feet.
It could be 5x, 5 being the digit, x being "a number"
When we are given a system of 3 linear equations, with 3 variables, we proceed as follows:
We consider 2 pairs or equations, for example (1, 2) and (2, 3), and eliminate one of the variables in each pair, creating a system of 2 linear equations with 2 unknowns.
Note that the third equation contains -2y which can be used to eliminate easily -6y in the second equation, and -4y in the fourth.
i) consider equations 1 and 3:
-3x-4y-3z=-7
5x-2y+5z=9
multiply the second equation by -2:
-3x-4y-3z=-7
-10x+4y-10z=-18
adding the 2 equations we have -13x-13z=-25
ii) consider equations 2 and 3. Multiply the third equation by -3:
2x-6y+2z=3
-15x+6y-15z=-27
adding the 2 equations we have -13x-13z=-24
So we got -13x-13z is -25, but also -24. this means the system is inconsistent, so it has no solution.
Answer: the system has no solutions
Factoring Quadratic Equations.
U use the FOIL method to factor trinomials into binomial that would then allow you to find the solutions to the problem
X ( a number) / (divided by) 2 (two)
X divided by two.
or
The quotient of x and 2.