A = k + mb
so, using the given data, you know that you just have to solve
k+5m = 19
k+10m=34
Clearly, m=3, so when B=7,
A = k+7m = k+5m + 2m = 19+6 = 25
A is partly constant and partly varies with B. When B =5, A=19 and when B=10, A=34. Find A when B is 7
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