Question

If |4x - y =1

|3x +2y = 20 then x – y is:
A) - 5;
b) 2;
B) 7;
D) 5.
with explanation pls​

Answer 1

• x = 2
• y = 7
• x - y = -5

Explanation:

We have been two algebraic expressions which is given below:

• 4x - y = 1
• 3x + 2y = 20

We have to find the value of x - y. so we need to find the value of x and y.

4x - y = 1 * 3

3x + 2y = 20 * 4

• 12x - 3y = 3
• 12x + 8y = 80

--------------------

-11y = - 77

y = 77/11

y = 7

• Substitute the value of y in equation 1.

4x - y = 1

4x - 7 = 1

4x = 1 + 7

4x = 8

x = 8/4

x = 2

• x - y
• 2 - 7 = -5
• Therefore, the required value of x, y , and x - y are 2,7 and -5 respectively.