Question

solve by substitution method 2x - 3y - 3 = 7 ; 4x - 5y - 5 = 10​

Answer 1

Answer:

x = -5/2, y = -5

Step-by-step explanation:

2x - 3y -3 = 7 -------------1️⃣

4x - 5y - 5 = 10 -----------2️⃣

2x - 3y -3 = 7

x = (3y + 10)/2

x = 3y/2 + 5

put this value in second equation,

4x - 5y - 5 = 10

therefore,

4(3y/2 + 5) - 5y - 5 = 10

6y + 20 - 5y - 5 = 10

[ y = -5 ]

put this value in first equation,

2x - 3(-5) -3 = 7

2x + 12 = 7

2x = -5

[ x = -5/2 ]