Question

1. Find the value of y in the equation 2x + y = 7 if x = 1. Find x, if y=0
​

Answer 1

Answer:

(i) find y if x = 2

2x + y  = 7

2 multiplied by 2 + y = 7

4 + y = 7

y = 7 - 4 (because 4 is transposed to RHS to LHS)

y = 3

therefore the value of y is 3

(ii) find the value of x if

y = 1

2x + y = 7

2x + 1 = 7

2x = 7 -1 (1 is transposed to LHS to RHS)

2x = 6

x= 6 ÷ 2

x = 3

therefore the value of  is 3

Step-by-step explanation:

Answer 2

Given: Equation 2x+y=7 is given

To find: Value of y if x=1 and value of x if y=0

Explanation: In first case: x=1

Putting x=1 in 2x+y=7:

2*1+y= 7

=> 2+y =7

=> y= 7-2( Transposing 2 to other side)

= 5

Therefore, y= 5 in this case.

In second case: y=0

Putting y= 0 in equation 2x+y=7:

2*x + 0 =7

=> 2x =7

=> x = 7/2( Dividing both sides by 2)

= 3.5

Therefore, x= 3.5 in this case.

Therefore, value of y when x=1 is 5 and value of x when y= 0 is 3.5