Question

Solve for x and y:10x+15y+25=0, 7x-2y-20=0​

Answer 1

Answer:

20x + 30y = -50 eq 1

105x - 30y = 300 eq 2

eq 2 + eq 1

125x = 250

x = 250/125;

x=2

put x=2 in any of the equations

7*2 - 2y = 20

-2y = 20 -14

-2y = 6

y = -6/2;

y = -3

Step-by-step explanation:

The idea is to make the coefficients same of either both x's or both the y's. let's do for y

LCM of 15 and 2 is 30

Multiply the first equation with 2 and the second equation with 15 to make both y's as 30y