4×2y=5 2x+3y=15/2,nilai 2x+5y=

[tex]4 \times 2y = 5 \\ 2y = \frac{5}{4} \\ y = \frac{5}{4} \times \frac{1}{2} \\ y = \frac{5}{8} \\ \\ 2x + 3y = \frac{15}{2} \\ 2x + 3 \times \frac{5}{8} = \frac{15}{2} \\ 2x + \frac{15}{8} = \frac{15}{2} \\ 2x = \frac{15}{2} - \frac{15}{8} \\ 2x = \frac{45}{8} \\ x = \frac{45}{8} \times \frac{1}{2} \\ x = \frac{45}{16} \\ \\ 2x + 5y = 2 \times \frac{45}{16} + 5 \times \frac{5}{8} \\ 2x + 5y = \frac{45}{8} + \frac{25}{8} \\ 2x + 5y = \frac{70}{8} [/tex]