Answer:
Part 1) The equation in slope intercept form is
![y=4x-8](https://img.qammunity.org/2020/formulas/mathematics/middle-school/b2cfpwf044wda6u5d51gxwbauec5f6q6ck.png)
Explanation:
Part 1) Write an equation in slope-intercept form for a line that passes through (3,4) (and has a y intercept of -8)
we know that
The equation of a line in slope intercept form is equal to
![y=mx+b](https://img.qammunity.org/2020/formulas/mathematics/high-school/8nudzfk4b5l0arb9iixag2w8am6zn99zlr.png)
where
m is the slope
b is the y-intercept
we have
![b=-8](https://img.qammunity.org/2020/formulas/mathematics/middle-school/qvrpwo17vi00h0t5iy48k3gu2rycflvhe3.png)
![point\ (3,4)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/zd6re4tfgid4kf6sffgba9gbgaevhi681h.png)
substitute
![4=m(3)-8](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4ddvs4dpriaayqvhxrh9haljjfbspm8uhf.png)
solve for m
![4+8=3m](https://img.qammunity.org/2020/formulas/mathematics/middle-school/weas1j4gfmvozw4h06r9nsv16u82rvzvvu.png)
![3m=12](https://img.qammunity.org/2020/formulas/mathematics/middle-school/qro35jxm3xsv6zye2cjwn73856cku2ud5a.png)
![m=4](https://img.qammunity.org/2020/formulas/mathematics/high-school/xpv5828ne56hdaq021276ipjbtebr3swor.png)
therefore
![y=4x-8](https://img.qammunity.org/2020/formulas/mathematics/middle-school/b2cfpwf044wda6u5d51gxwbauec5f6q6ck.png)