Question

(i) х + 2y +1 = 0, 2x – 3y - 12 = 0 Cross multiplication method ​

Answer 1

Answer:

• x = 3
• y = -2

Step-by-step explanation:

• х + 2y +1 = 0, 2x – 3y - 12 = 0

• x+2y+1=0,2x−3y−12=0
• Choose one of the equations and solve it for x by isolating x on the left hand side of the equal sign.
• x+2y+1=0
• Subtract 1 from both sides of the equation.
• x+2y=−1
• Subtract 2y from both sides of the equation.
• 2(−2y−1)−3y−12=0
• −4y−2−3y−12=0
• −7y−2−12=0
• −7y−14=0
• −7y=14
• y=−2
• Substitute −2 for y in x=−2y−1. Because the resulting equation contains only one variable, you can solve for x directly.

• x=−2(−2)−1
• x=4−1
• x=3

• x=3,y=−2

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