Find the solution of this system of linear equations. Separate the x - and y-values with a comma 10x + 15y = 20 - 9x - 15y = - 21

First Equation,

10x + 15y = 20

Second Equation,

- 9x - 15y = - 21

First Equation + Second Equation,

10x + 15y - 9x - 15y = 20 - 21

x = - 1

Substituting value of x in First Equation,

10 (-1) + 15y = 20

-10 + 15y = 20

15y = 30

y = 2

Hence, the solution is (-1, 2)