Question

3x+7y=68 3x-y=4 in elimination

Answer 1

Answer:

Given,

3x + 7y= 68

3x - y = 4

subtract 2 equations

3x - 3x + 7y + y = 68 - 4

8y = 64

y = 8

substitute y value in any of 2 equations

3x - 8 = 4

3x = 12

x = 4

values of x and y are 4 and 8 respectively