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-2a+b = 10
----------------(-)
5a = 5
a = 1
3(1)+b = 15
b = 15-3 = 12
f(x) = x + 12
f(7) = 7 + 12 = 19
3a + b = 15
f(-2) = 10
-2a + b = 10
3a+b=15
-2a+b=10₋
5a = 5
a = 1 ---> 3a + b = 15
3(1) + b = 15
3 + b =15
b = 12
Jadi a=1 b= 12
b. f(x) = ax+b
f(x) = 1x+12
f(x) = x+12
c. f(7) = 7 + 12
19