Question

If 2x+5y=21 and x+y=3 then what is the value of x ?

Answer 1

I believe x=3.

If you plug in 0 for X in x+y=3, you get that y=3.

When you plug it in (2x+5(3)=21) you get 2x+15=21.

When you subtract 15 from 21, you're left with 2x=6. Divide both sides by 2, and x=3.

I hope I was able to help. Best of luck.

Answer 2

Value of variable 'x' is (-2).

Equations given in the question are,

2x + 5y = 21 -------(1)

x + y = 3 ------(2)

Multiply equation (2) by 2 then subtract it from equation (1),

(2x + 5y) - (2x + 2y) = 21 - 2×3

2x + 5y - 2x - 2y = 21 - 6

3y = 15

y = 5

By substituting the value of 'y' in equation (2),

x + 5 = 3

x = 3 - 5

x = -2

    Therefore, value of variable 'x' will be (-2).

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