4r + y = 23
3x - y= 12

9514 1404 393

  (x, y) = (5, 3)

Step-by-step explanation:

We presume your two equations are ...

The coefficients of y are opposites, so we can add these equations to eliminate y:

  (4x +y) +(3x -y) = (23) +(12)

  7x = 35

  x = 5

Substituting into the second equation, we get ...

  3(5) -y = 12

  y = 15 -12 = 3

The solution is (x, y) = (5, 3).

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2