Question

14=x+2y and 21= 3x + 10/4y solve for x and y

Answer 1

Substitution might work here.

Answer 2

Are these the two equations?
Is the second equation correct?

\(14 = x + 2y\)

\(21 = 3x + \dfrac{10}{4}y\)

Answer 3

yes

Answer 4

Ok, rewrite the second equation as

\(21 = 3x + 2.5y\)

Answer 5

Now multiply the top equation by -3, and add it to the second equation.
That will eliminate the x variable.