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11x+13=90
11x=77
x=7
A = 7x+4
= (7x7)+4
= 49+4 = 53
B = 4x+9
= (4x7)+9
= 28+9
= 37
11x + 13 = 90
11x = 90 - 13
11x = 77 , maka x = 77 ÷ 11 = 7
nilai A = 7x + 4 = (7×7) + 4 = 49 +4 = 53
nilai B = 4x +9 = ( 4 × 7 ) + 9 = 28 + 9 = 37