if x + 4 y = 5 and 5 x + 6 y = 7 , then 3 x + 5 y = ?
add the left terms and right terms of the two equation to obtain a new equation x + 5 x + 4 y + 6 y = 5 + 7 group and simplify 6 x + 10 y = 12 divide all terms of the above equation by 2 to obtain a new equation 3 x + 5 y = 6 correct answer a
add(multiply(5, divide(subtract(multiply(5, 5), 7), subtract(multiply(5, 4), 6))), multiply(subtract(5, multiply(divide(subtract(multiply(5, 5), 7), subtract(multiply(5, 4), 6)), 4)), 3))