Question

3x - y = 17
4x + y = -3

Answer 1

x = 7, y = 4

Explanation:

simultaneous equation:

3x-y=17

4x+y=-3

• Solving for x: add the two equations together to cancel out y (-y + y = 0)
• 7x = 14
• divide both sides by 7 to get the value of 1 x
• x = 7

• solving for y: substitue the value of x (7) into any equation (we'll use the top one for ease)
• 3(7) - y = 17
• so in other words; 21 - y = 17
• subtract 21 from both sides to get the value of -y
• -y = -4
• therefore, y = 4