Question

Please help me find the value of y

Answer 1

Answer:

Option C

Step-by-step explanation:

Given set of equations:

• x + 2y = 20 ...(i)
• 2x - 3y = -1 ...(ii)

We have to find out the expression that can be substituted in order to find the value of y in the second equation.

From equation (i),

• x + 2y = 20

Subtract 2y from both sides:

• x + 2y-2y = 20-2y
• x = -2y+20

Thus to find the value of y in eqn(ii), we substitute x = -2y+20.

Option C goes correct.