You spend $77 shopping. you buy some shirts at $12 each, and spend $5 on food. how many shirts did you buy? a. 5x + 12 = 77 b. x(12 + 5) = 77 c. 12x + 5 = 77 d. 12*5+x=77

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If the model is good, then both points will check in the equation. Substituting 8 for x and 5 for y in the equation results in 56 – 50 = 3, which is not true. Therefore, the model is not good. Using (–12, –9) as a check results in –84 + 90 = 3. The constant value in the equation should be 6, not 3. In slope-intercept form, the y-intercept should be –3/5.