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Solution:.a + b = 15 -> equation 15a - 3b = 11 -> equation 2.multiply equation one by 3 both sides, you will get 3(a + b) = 3(15)--> 3a + 3b = 45.then add this to equation two:. 3a + 3b = 45+ 5a - 3b =11------------------------- 8a = 56divide both sides by 8: .8a = 568a/8 = 56/8a = 7.back substitute a = 7 in the original equation one:.a + b = 15 if a = 7, then7 + b = 15 b = 15 - 7 b = 8answers: a = 7, b = 8 .Kindly rate and accept the answers (at least 3 stars)If you still have some more math (science or other questions) Feel free to ask, you can request me by putting my name first at the start of your question post, like "FOR MR. GLENN only! "Thank you!!!