K_Algebra 1-4 ?? Linear equations & graphs, 解析a, b对吗？

这样解析a, b in y = a + bx 对吗？

 About this unit

In this unit, we learn about linear equations and how we can use their graphs to solve problems.

Linear equations & graphs  0/1500 Mastery points

• Two-variable linear equations intro: Linear equations & graphs
• Slope: Linear equations & graphs
• Horizontal & vertical lines: Linear equations & graphs
• x-intercepts and y-intercepts: Linear equations & graphs
• Applying intercepts and slope  (I think this is tough questions)

下面这两道题, 这样解析a, b in y = a + bx 对吗？

after two questions, I skip this practice. I don't think this interpretation is right. 

Is this question can be solved using proportion?

5/360 = ? /18  ?= 5 * 18 /360 = 1/4