Question

If the ordered pair (-3,5) is a solution of 3x + 4y = k, what is the value of k?

Answer 1

11

with the values plugged in the equation is 3(-3)+4(5)=k which simplifies to -9+20=k and then to 11=k

Answer 2

(x, y) ⇒ (-3, 5)               3x + 4y = k
Plug in -3 for x and 5 for y in the equation.

3(-3) + 4(5) = k
-9 + 20 = k

k = 11