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

  • -17
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