Question

x-3y-7=0 and 3x-3y-15=0: solve with cross multiplication method

Answer 1

Answer:

x = 4, y = -1

Step-by-step explanation:

Rearrange the two equations, where the variables are on the other side of the equal sign and the numbers on the other sideas follows;

x - 3y = 7

3x - 3y = 15,

choose between the two variables which one is to be eliminated. So in this case, we choose Y, since its coefficients are equal and easy to eliminate. So we subtract the two equations simultaneously, to give X = 4.

choose any of the two equations where we can substitute the value for X, i.e;

x - 3y = 7

(4) - 3y = 7, group the like terms together to get;

-3y = 3, then use the multiplicative inverse to get Y = -1

∴X = 4, Y = -1