50% of cakes jenny baked that week was party cakes, 1/5 were fruit cakes and the remainder were sponge cakses what is the percentage of sponge cakes

Use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2 + 9 = −26 −3 − 7 = 13