Answer:
(7.51,-1.3)
Explanation:
rewrite 5-0.7x=0.2y in terms of x,
divide both sides by 0.2 to get: 25-3.5x = y
substitute the y part in -y+0.4x=4.3 with the new equation that we made
(in bold)
so,
-(25-3.5x) +0.4x = 4.3
expand and simplify
so,
-25 +3.5x +0.4x = 4.3 -> -25 +3.9x = 4.3 -> 3.9x = 29.3 -> x ≈ 7.51
now, substitute the new x (underlined) to the equation in bold
so,
25-3.5(7.51) = y -> y ≈ -1.3
graphing both equations on desmos can verify the answers (only if you rearrange the two equations to get y by itself)