Question

2x+5y=0 3x-4y=23 find x and y simultaneous equations

Answer 1

`\\\\\left\{\begin{array}{ccc}x&=&5\\y&=&-2\\\end{array}\right.\\`

Explanation:

Using elimination method

`\left\{\begin{array}{ccc}2x+5y&=&0\\3x-4y&=&23\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}x&=&-(5y)/(2)\\3*(-(5y)/(2))-4y&=&23\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}x&=&-(5y)/(2)\\(-23y)/(2)&=&23\\\end{array}\right.\\\\\\\left\{\begin{array}{ccc}y&=&-2\\x&=&5\\\end{array}\right.\\`

Answer 2

× & y = (5,-2)

Explanation:

set x to 0 to solve for y

set y to 0 to solve for x