If i had 12 eggs and i added -13 minus 2 what does it equal??

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'