Ask Question
11 February, 04:19

Solve the system of equations. - 4x+7y = 20 & y=3x+15

solve for x and y using substitution

+3
Answers (1)
  1. 11 February, 06:26
    0
    Substitute y = 3x + 15 to the equation - 4x + 7y = 20:

    -4x + 7 (3x + 15) = 20 use distributive property

    -4x + (7) (3x) + (7) (15) = 20

    -4x + 21x + 105 = 20 subtract 105 from both sides

    17x = - 85 divide both sides by 17

    x = - 5

    Substitute the value of x to the equation y = 3x + 15:

    y = 3 (-5) + 15

    y = - 15 + 15

    y = 0

    Answer: x = - 5 and y = 0
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “Solve the system of equations. - 4x+7y = 20 & y=3x+15 solve for x and y using substitution ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers