simultaneous equations step 1: write the equations as follows:
5x + 2y = 7 (1) -2x + 6y = 9 (2)
eliminate x or y. I am going to choose x, and I will eliminate it as follows:
(x2) ...5x + 2y = 7 (1) (x5) ..-2x + 6y = 9 (2)
now I will complete the multipication:
10x + 4y = 14 (3) -10x + 30y = 45 (4)
Now add each of the terms as follows: 10x + (-10x)= 0 [i.e. they cancel], 4y and 30 y = 34y. and finally, 14 + 45 = 59 , so, you get:
34y = 59 divide both sides by 34 to get: y = 1.735294118
but remember, in the question, you were asked to round your answer to the nearest tenth, that is the number straight after the decimal point, because 1/10 (or a tenth) = 0.1. So, since the next digit after this is 3 (i.e. lower than 5), the final answer is: 1.7
