Question

- 5x + 2y = 9
y = 7x

Answer 1

x = 1

Step-by-step explanation:

- 5x + 2y = 9

• y = 7x

• Insert 7x For 'y'

- 5x + 2(7x) = 9

• Remove Parenthesis

-5x + 2 · 7x = 9

• Multiply: 2 · 7 = 14

-5x + 14x = 9

• Add: -5x + 14x = 9x

9x = 9

• Divide Both Sides By 9

9x ÷ 9 = 9 ÷ 9

x = 1