Question

What is the solution to the following system?

y = 5
-3x + 4y = 8

1. (-3, 5)

2. (-4, -20)

3. (5, 7)

4. (4, 5)

Answer 1

9514 1404 393

Answer:

4. (4, 5)

Explanation:

Use substitution to put the value for y in the second equation.

-3x +4(5) = 8

-3x = -12 . . . . . . . subtract 20

x = 4 . . . . . . . . . . divide by -3

The solution is (x, y) = (4, 5).