в) { 4x-3y=7, 5x+2y=26
y = 13 - 2.5x
4x - 39 + 7.5x = 7
11.5x = 46
x = 4
y = 13 - 10 = 3
г) {3x-5y=0 8y-5x=-1
y = 0.6x
4.8x-5x = -1
-0.2x = -1
x = 5
y = 3
в) { 4x-3y=7, 5x+2y=26
y = 13 - 2.5x
4x - 39 + 7.5x = 7
11.5x = 46
x = 4
y = 13 - 10 = 3
г) {3x-5y=0 8y-5x=-1
y = 0.6x
4.8x-5x = -1
-0.2x = -1
x = 5
y = 3