Question 267033
here is the system
(i) {{{10x + 20y = 50}}}
(ii) {{{-15x + 20y = 50}}}
step 1 - multiply (i) by (-1) to get
(iii) {{{-10x - 20y = -50}}}
step 2 - add (ii) and (iii) to get
(iv) {{{-25x = 0}}}
step 3 - divide to get
(v) {{{x = 0}}}
step 4 - find y and we get
(v) {{{y = 2.5}}}