For this case, the first thing we must do is define a variable.
We have then:
x: George Sisler's average
y: Suzuki's average
We then have the following equation that models the problem:
![x = 0.070 + y](https://img.qammunity.org/2019/formulas/mathematics/high-school/60d0qnnwhjkiw9vyzegzcj075vyopax7q9.png)
Substituting values we have:
Answer:
Sisler's batting average that year was:
x = 0.420