Greetings!
To find the slope and y-intercept of this line, we need to rearrange the equation into slope y-intercept form:
![y=mx+b](https://img.qammunity.org/2019/formulas/mathematics/college/hmt7wxoetxgettvoxgzsv2e1z1jn04v2qq.png)
To accomplish this, let's first isolate the y variable:
![-7x-4y=12](https://img.qammunity.org/2019/formulas/mathematics/middle-school/9ntklpx6zn1log432gm4x33x59h2sjuoaw.png)
First, add 7x to both sides:
![(-7x-4y)+(7x)=(12)+(7x)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/mlks3x65flj3ofbnrii54wpyat70396zqb.png)
![-4y=7x+12](https://img.qammunity.org/2019/formulas/mathematics/middle-school/o4xwtlb867noyu45el2ve7hqhx3li8xfrn.png)
Divide both sides of the equation by -4:
![(-4y)/(-4)=(7x+12)/(-4)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/aiohdkbr2vk32r8l4umv6r6c64esqfs0bv.png)
![y=(7)/(-4)x+(12)/(-4)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/cph2ixw779s5r42dndja7hl5cxfowesjcm.png)
![y=-(7)/(-4)x-3](https://img.qammunity.org/2019/formulas/mathematics/middle-school/tfs1aq7a9p1l6nqk9y8jq86r3cc9yr23ur.png)
The slope (m) is equal to:
![\boxed{-(7)/(4)}](https://img.qammunity.org/2019/formulas/mathematics/middle-school/wjbvd33v1e5evq2qkxxw3ciginmao09gab.png)
The y-intercept (b) is equal to:
![\boxed{-3}](https://img.qammunity.org/2019/formulas/mathematics/middle-school/1xyers1hby5k2x88iuqraty03ihyz9v9ld.png)
I hope this helped!
-Benjamin