Question

find the area of a triangle which is formed by the lines y=x+1, y=4x+5 and y=7-x​

Answer 1

Answer:

1. x+1=4x+5=7-x
2. so equal of the x value
3. x values are take one side
4. x+4x-x=1+5+7
5. 4x=13
6. x=13/4
7. y=13/4+1=13+4/4=17/4
8. y=4(13/4)+5=18
9. y=7-13/4=28-13/4=15/4
10. y(17/4, 18, 15/4)