Y{n} +y=-sinx , nghiệm của pt này ?

1.) 2x + y = 3 2.) x - 2y = -1 if equation 1 is multiplied by 2 and then the equations are added, the result is a.3x = 2 b.3x = 5 c.5x = 5

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

How do i multiply two digit numbers