how to multiply 15=a+2d by 25= 2a+9d please anwer just now as my test is tomoorow
Given the equations
If we want to calculate the values of a and d, then we can eliminate any of a or d and calculate the other.
In this case, multiply equation (1) by 2, so that the coefficients of a become equal.
Subtracting equation (2) from (3), we get
Substitute the value of d in equation (1).
Thus, we get