Question

Solve for x and y: x – 3y – 7 = 0; 3x – 3y = 15.​

Answer 1

Answer:

x = 4

y = -1

Step-by-step explanation:

From first equation we can find out the value of x

x - 3y = 7

x = 7 + 3y

put the value of x in second equation

3(7+3y) ‐ 3y = 15

21 + 9y - 3y = 15

6y = 15 - 21

6y = -6

y = -1

put the value of y in first equation

x - 3(-1) = 7

x + 3 = 7

x = 4