How do you solve this system of equations: 5y - 4x = 10 and x - 7y = - 37?

1 Answer
Nov 20, 2017

x = -1957/23
y = -158/23

Explanation:

  1. Solve equation 2 for x
    x - 7y = 37
    x = 7y + 37

  2. Substitute (7y + 37) in for x in equation 1
    5y - 4(7y + 37) = 10

  3. Solve equation for y
    5y - 28y - 148 = 10
    -23y = 158
    y = -158/23

  4. Subsititute and solve
    -158/23 in for y in equation 2
    x - 7( -158/23 ) = -37
    x + 1106/23 = -37
    x = -1957/23

  5. x = -1957/23
    y = -158/23

You can divide each x and y for the decimal form too!