Question

-x + 2y =0, 10x + 15y =105 simplify ​

Answer 1

Step-by-step explanation:

$- x + 2y = 0 \\10x + 15y = 105 \\ \\ (10x + 15y = 105) \div 5 \\ ⟹ 2x + 3y = 21 \\ \\( - x + 2y = 0) \times 2 \\ - 2x + 4y = 0 \\ \\ 2x + 3y = 21 \\ - 2x + 4y = 0 \\ - - - - - - - \\ 7y = 21 \\ y = \frac{21}{7} \\ \large \boxed{ y = \underline{ \underline{ \bf 3}}} \\ \\ 2x + 3y = 21 \\ 2x + 3(3) = 21 \\ 2x + 9 = 21 \\ 2x = 21 - 9 \\ 2x = 12 \\ x = \frac{12}{2} \\ \large \boxed{x =\underline{ \underline{ \bf 6}}}$