Homework Help

Solve y = 4x - 3 and y = -4x + 5. Use the substitution method.

user profile pic

kittyremis | eNotes Newbie

Posted September 30, 2012 at 5:46 PM via web

dislike 1 like

Solve y = 4x - 3 and y = -4x + 5. Use the substitution method.

2 Answers | Add Yours

user profile pic

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted September 30, 2012 at 6:31 PM (Answer #1)

dislike 1 like

The equations y = 4x - 3 and y = -4x + 5 have to be solved

Substitute y = 4x - 3 in y = -4x + 5

=> 4x - 3 = -4x + 5

=> 8x = 8

=> x = 1

y = 4x - 3 = 4 - 3 = 1

The solution of the equations is x = 1 and y = 1

user profile pic

aa42 | Student, Grade 10 | eNoter

Posted October 1, 2012 at 7:44 PM (Answer #3)

dislike 0 like

4x-3=-4x+5

4x+4x=5+3

8x=8

x=8/8

x=1

Substitute value of ''x'' in eq.2

y=-4x+5

y=-4(1)+5

y=-4+5

y=1

So,

      x=1 and y=1

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes